#include <stdarg.h>
#include <stdint.h>
#include <stddef.h>
-#include <AvailabilityMacros.h>
+#include <Availability.h>
#include <TargetConditionals.h>
#if TARGET_OS_MAC
/* Types */
+#if !OBJC_TYPES_DEFINED
+
+/// An opaque type that represents a method in a class definition.
typedef struct objc_method *Method;
+
+/// An opaque type that represents an instance variable.
typedef struct objc_ivar *Ivar;
+
+/// An opaque type that represents a category.
typedef struct objc_category *Category;
+
+/// An opaque type that represents an Objective-C declared property.
typedef struct objc_property *objc_property_t;
struct objc_class {
- Class isa;
+ Class _Nonnull isa OBJC_ISA_AVAILABILITY;
#if !__OBJC2__
- Class super_class OBJC2_UNAVAILABLE;
- const char *name OBJC2_UNAVAILABLE;
+ Class _Nullable super_class OBJC2_UNAVAILABLE;
+ const char * _Nonnull name OBJC2_UNAVAILABLE;
long version OBJC2_UNAVAILABLE;
long info OBJC2_UNAVAILABLE;
long instance_size OBJC2_UNAVAILABLE;
- struct objc_ivar_list *ivars OBJC2_UNAVAILABLE;
- struct objc_method_list **methodLists OBJC2_UNAVAILABLE;
- struct objc_cache *cache OBJC2_UNAVAILABLE;
- struct objc_protocol_list *protocols OBJC2_UNAVAILABLE;
+ struct objc_ivar_list * _Nullable ivars OBJC2_UNAVAILABLE;
+ struct objc_method_list * _Nullable * _Nullable methodLists OBJC2_UNAVAILABLE;
+ struct objc_cache * _Nonnull cache OBJC2_UNAVAILABLE;
+ struct objc_protocol_list * _Nullable protocols OBJC2_UNAVAILABLE;
#endif
} OBJC2_UNAVAILABLE;
/* Use `Class` instead of `struct objc_class *` */
+#endif
+
#ifdef __OBJC__
@class Protocol;
#else
typedef struct objc_object Protocol;
#endif
+/// Defines a method
struct objc_method_description {
- SEL name;
- char *types;
+ SEL _Nullable name; /**< The name of the method */
+ char * _Nullable types; /**< The types of the method arguments */
};
+/// Defines a property attribute
+typedef struct {
+ const char * _Nonnull name; /**< The name of the attribute */
+ const char * _Nonnull value; /**< The value of the attribute (usually empty) */
+} objc_property_attribute_t;
+
/* Functions */
-OBJC_EXPORT id object_copy(id obj, size_t size);
-OBJC_EXPORT id object_dispose(id obj);
-
-OBJC_EXPORT Class object_getClass(id obj)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT Class object_setClass(id obj, Class cls)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-
-OBJC_EXPORT const char *object_getClassName(id obj);
-OBJC_EXPORT void *object_getIndexedIvars(id obj);
-
-OBJC_EXPORT id object_getIvar(id obj, Ivar ivar)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT void object_setIvar(id obj, Ivar ivar, id value)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-
-OBJC_EXPORT Ivar object_setInstanceVariable(id obj, const char *name, void *value);
-OBJC_EXPORT Ivar object_getInstanceVariable(id obj, const char *name, void **outValue);
-
-OBJC_EXPORT id objc_getClass(const char *name);
-OBJC_EXPORT id objc_getMetaClass(const char *name);
-OBJC_EXPORT id objc_lookUpClass(const char *name);
-OBJC_EXPORT id objc_getRequiredClass(const char *name);
-OBJC_EXPORT Class objc_getFutureClass(const char *name)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT void objc_setFutureClass(Class cls, const char *name)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT int objc_getClassList(Class *buffer, int bufferCount);
-
-OBJC_EXPORT Protocol *objc_getProtocol(const char *name)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT Protocol **objc_copyProtocolList(unsigned int *outCount)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-
-OBJC_EXPORT const char *class_getName(Class cls)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT BOOL class_isMetaClass(Class cls)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT Class class_getSuperclass(Class cls)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT Class class_setSuperclass(Class cls, Class newSuper)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER_BUT_DEPRECATED;
-
-OBJC_EXPORT int class_getVersion(Class cls);
-OBJC_EXPORT void class_setVersion(Class cls, int version);
-
-OBJC_EXPORT size_t class_getInstanceSize(Class cls)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-
-OBJC_EXPORT Ivar class_getInstanceVariable(Class cls, const char *name);
-OBJC_EXPORT Ivar class_getClassVariable(Class cls, const char *name)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT Ivar *class_copyIvarList(Class cls, unsigned int *outCount)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-
-OBJC_EXPORT Method class_getInstanceMethod(Class cls, SEL name);
-OBJC_EXPORT Method class_getClassMethod(Class cls, SEL name);
-OBJC_EXPORT IMP class_getMethodImplementation(Class cls, SEL name)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT IMP class_getMethodImplementation_stret(Class cls, SEL name)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT BOOL class_respondsToSelector(Class cls, SEL sel)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT Method *class_copyMethodList(Class cls, unsigned int *outCount)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-
-OBJC_EXPORT BOOL class_conformsToProtocol(Class cls, Protocol *protocol)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT Protocol **class_copyProtocolList(Class cls, unsigned int *outCount)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-
-OBJC_EXPORT objc_property_t class_getProperty(Class cls, const char *name)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT objc_property_t *class_copyPropertyList(Class cls, unsigned int *outCount)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-
-OBJC_EXPORT const char *class_getIvarLayout(Class cls)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT const char *class_getWeakIvarLayout(Class cls)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-
-OBJC_EXPORT id class_createInstance(Class cls, size_t extraBytes);
-
-OBJC_EXPORT Class objc_allocateClassPair(Class superclass, const char *name,
- size_t extraBytes)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT void objc_registerClassPair(Class cls)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT Class objc_duplicateClass(Class original, const char *name,
- size_t extraBytes)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT void objc_disposeClassPair(Class cls)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-
-OBJC_EXPORT BOOL class_addMethod(Class cls, SEL name, IMP imp,
- const char *types)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT IMP class_replaceMethod(Class cls, SEL name, IMP imp,
- const char *types)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT BOOL class_addIvar(Class cls, const char *name, size_t size,
- uint8_t alignment, const char *types)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT BOOL class_addProtocol(Class cls, Protocol *protocol)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT void class_setIvarLayout(Class cls, const char *layout)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT void class_setWeakIvarLayout(Class cls, const char *layout)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-
-
-OBJC_EXPORT SEL method_getName(Method m)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT IMP method_getImplementation(Method m)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT const char *method_getTypeEncoding(Method m)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-
-OBJC_EXPORT unsigned int method_getNumberOfArguments(Method m);
-OBJC_EXPORT char *method_copyReturnType(Method m)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT char *method_copyArgumentType(Method m, unsigned int index)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT void method_getReturnType(Method m, char *dst, size_t dst_len)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT void method_getArgumentType(Method m, unsigned int index,
- char *dst, size_t dst_len)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT struct objc_method_description *method_getDescription(Method m)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-
-OBJC_EXPORT IMP method_setImplementation(Method m, IMP imp)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT void method_exchangeImplementations(Method m1, Method m2)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-
-OBJC_EXPORT const char *ivar_getName(Ivar v)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT const char *ivar_getTypeEncoding(Ivar v)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT ptrdiff_t ivar_getOffset(Ivar v)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-
-OBJC_EXPORT const char *property_getName(objc_property_t property)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT const char *property_getAttributes(objc_property_t property)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-
-OBJC_EXPORT BOOL protocol_conformsToProtocol(Protocol *proto, Protocol *other)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT BOOL protocol_isEqual(Protocol *proto, Protocol *other)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT const char *protocol_getName(Protocol *p)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT struct objc_method_description protocol_getMethodDescription(Protocol *p, SEL aSel, BOOL isRequiredMethod, BOOL isInstanceMethod)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT struct objc_method_description *protocol_copyMethodDescriptionList(Protocol *p, BOOL isRequiredMethod, BOOL isInstanceMethod, unsigned int *outCount)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT objc_property_t protocol_getProperty(Protocol *proto, const char *name, BOOL isRequiredProperty, BOOL isInstanceProperty)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT objc_property_t *protocol_copyPropertyList(Protocol *proto, unsigned int *outCount)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT Protocol **protocol_copyProtocolList(Protocol *proto, unsigned int *outCount)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-
-OBJC_EXPORT const char **objc_copyImageNames(unsigned int *outCount)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT const char *class_getImageName(Class cls)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT const char **objc_copyClassNamesForImage(const char *image,
- unsigned int *outCount)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-
-OBJC_EXPORT const char *sel_getName(SEL sel);
-OBJC_EXPORT SEL sel_getUid(const char *str);
-OBJC_EXPORT SEL sel_registerName(const char *str);
-OBJC_EXPORT BOOL sel_isEqual(SEL lhs, SEL rhs)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-
-OBJC_EXPORT void objc_enumerationMutation(id)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT void objc_setEnumerationMutationHandler(void (*handler)(id))
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-
-OBJC_EXPORT void objc_setForwardHandler(void *fwd, void *fwd_stret)
- AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
-
-
-/* Associated Object support. */
-
-/* objc_setAssociatedObject() options */
-enum {
- OBJC_ASSOCIATION_ASSIGN = 0,
- OBJC_ASSOCIATION_RETAIN_NONATOMIC = 1,
- OBJC_ASSOCIATION_COPY_NONATOMIC = 3,
- OBJC_ASSOCIATION_RETAIN = 01401,
- OBJC_ASSOCIATION_COPY = 01403
+/* Working with Instances */
+
+/**
+ * Returns a copy of a given object.
+ *
+ * @param obj An Objective-C object.
+ * @param size The size of the object \e obj.
+ *
+ * @return A copy of \e obj.
+ */
+OBJC_EXPORT id _Nullable object_copy(id _Nullable obj, size_t size)
+ OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0)
+ OBJC_ARC_UNAVAILABLE;
+
+/**
+ * Frees the memory occupied by a given object.
+ *
+ * @param obj An Objective-C object.
+ *
+ * @return nil
+ */
+OBJC_EXPORT id _Nullable
+object_dispose(id _Nullable obj)
+ OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0)
+ OBJC_ARC_UNAVAILABLE;
+
+/**
+ * Returns the class of an object.
+ *
+ * @param obj The object you want to inspect.
+ *
+ * @return The class object of which \e object is an instance,
+ * or \c Nil if \e object is \c nil.
+ */
+OBJC_EXPORT Class _Nullable
+object_getClass(id _Nullable obj)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Sets the class of an object.
+ *
+ * @param obj The object to modify.
+ * @param cls A class object.
+ *
+ * @return The previous value of \e object's class, or \c Nil if \e object is \c nil.
+ */
+OBJC_EXPORT Class _Nullable
+object_setClass(id _Nullable obj, Class _Nonnull cls)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+
+/**
+ * Returns whether an object is a class object.
+ *
+ * @param obj An Objective-C object.
+ *
+ * @return true if the object is a class or metaclass, false otherwise.
+ */
+OBJC_EXPORT BOOL
+object_isClass(id _Nullable obj)
+ OBJC_AVAILABLE(10.10, 8.0, 9.0, 1.0, 2.0);
+
+
+/**
+ * Reads the value of an instance variable in an object.
+ *
+ * @param obj The object containing the instance variable whose value you want to read.
+ * @param ivar The Ivar describing the instance variable whose value you want to read.
+ *
+ * @return The value of the instance variable specified by \e ivar, or \c nil if \e object is \c nil.
+ *
+ * @note \c object_getIvar is faster than \c object_getInstanceVariable if the Ivar
+ * for the instance variable is already known.
+ */
+OBJC_EXPORT id _Nullable
+object_getIvar(id _Nullable obj, Ivar _Nonnull ivar)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Sets the value of an instance variable in an object.
+ *
+ * @param obj The object containing the instance variable whose value you want to set.
+ * @param ivar The Ivar describing the instance variable whose value you want to set.
+ * @param value The new value for the instance variable.
+ *
+ * @note Instance variables with known memory management (such as ARC strong and weak)
+ * use that memory management. Instance variables with unknown memory management
+ * are assigned as if they were unsafe_unretained.
+ * @note \c object_setIvar is faster than \c object_setInstanceVariable if the Ivar
+ * for the instance variable is already known.
+ */
+OBJC_EXPORT void
+object_setIvar(id _Nullable obj, Ivar _Nonnull ivar, id _Nullable value)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Sets the value of an instance variable in an object.
+ *
+ * @param obj The object containing the instance variable whose value you want to set.
+ * @param ivar The Ivar describing the instance variable whose value you want to set.
+ * @param value The new value for the instance variable.
+ *
+ * @note Instance variables with known memory management (such as ARC strong and weak)
+ * use that memory management. Instance variables with unknown memory management
+ * are assigned as if they were strong.
+ * @note \c object_setIvar is faster than \c object_setInstanceVariable if the Ivar
+ * for the instance variable is already known.
+ */
+OBJC_EXPORT void
+object_setIvarWithStrongDefault(id _Nullable obj, Ivar _Nonnull ivar,
+ id _Nullable value)
+ OBJC_AVAILABLE(10.12, 10.0, 10.0, 3.0, 2.0);
+
+/**
+ * Changes the value of an instance variable of a class instance.
+ *
+ * @param obj A pointer to an instance of a class. Pass the object containing
+ * the instance variable whose value you wish to modify.
+ * @param name A C string. Pass the name of the instance variable whose value you wish to modify.
+ * @param value The new value for the instance variable.
+ *
+ * @return A pointer to the \c Ivar data structure that defines the type and
+ * name of the instance variable specified by \e name.
+ *
+ * @note Instance variables with known memory management (such as ARC strong and weak)
+ * use that memory management. Instance variables with unknown memory management
+ * are assigned as if they were unsafe_unretained.
+ */
+OBJC_EXPORT Ivar _Nullable
+object_setInstanceVariable(id _Nullable obj, const char * _Nonnull name,
+ void * _Nullable value)
+ OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0)
+ OBJC_ARC_UNAVAILABLE;
+
+/**
+ * Changes the value of an instance variable of a class instance.
+ *
+ * @param obj A pointer to an instance of a class. Pass the object containing
+ * the instance variable whose value you wish to modify.
+ * @param name A C string. Pass the name of the instance variable whose value you wish to modify.
+ * @param value The new value for the instance variable.
+ *
+ * @return A pointer to the \c Ivar data structure that defines the type and
+ * name of the instance variable specified by \e name.
+ *
+ * @note Instance variables with known memory management (such as ARC strong and weak)
+ * use that memory management. Instance variables with unknown memory management
+ * are assigned as if they were strong.
+ */
+OBJC_EXPORT Ivar _Nullable
+object_setInstanceVariableWithStrongDefault(id _Nullable obj,
+ const char * _Nonnull name,
+ void * _Nullable value)
+ OBJC_AVAILABLE(10.12, 10.0, 10.0, 3.0, 2.0)
+ OBJC_ARC_UNAVAILABLE;
+
+/**
+ * Obtains the value of an instance variable of a class instance.
+ *
+ * @param obj A pointer to an instance of a class. Pass the object containing
+ * the instance variable whose value you wish to obtain.
+ * @param name A C string. Pass the name of the instance variable whose value you wish to obtain.
+ * @param outValue On return, contains a pointer to the value of the instance variable.
+ *
+ * @return A pointer to the \c Ivar data structure that defines the type and name of
+ * the instance variable specified by \e name.
+ */
+OBJC_EXPORT Ivar _Nullable
+object_getInstanceVariable(id _Nullable obj, const char * _Nonnull name,
+ void * _Nullable * _Nullable outValue)
+ OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0)
+ OBJC_ARC_UNAVAILABLE;
+
+
+/* Obtaining Class Definitions */
+
+/**
+ * Returns the class definition of a specified class.
+ *
+ * @param name The name of the class to look up.
+ *
+ * @return The Class object for the named class, or \c nil
+ * if the class is not registered with the Objective-C runtime.
+ *
+ * @note \c objc_getClass is different from \c objc_lookUpClass in that if the class
+ * is not registered, \c objc_getClass calls the class handler callback and then checks
+ * a second time to see whether the class is registered. \c objc_lookUpClass does
+ * not call the class handler callback.
+ *
+ * @warning Earlier implementations of this function (prior to OS X v10.0)
+ * terminate the program if the class does not exist.
+ */
+OBJC_EXPORT Class _Nullable
+objc_getClass(const char * _Nonnull name)
+ OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns the metaclass definition of a specified class.
+ *
+ * @param name The name of the class to look up.
+ *
+ * @return The \c Class object for the metaclass of the named class, or \c nil if the class
+ * is not registered with the Objective-C runtime.
+ *
+ * @note If the definition for the named class is not registered, this function calls the class handler
+ * callback and then checks a second time to see if the class is registered. However, every class
+ * definition must have a valid metaclass definition, and so the metaclass definition is always returned,
+ * whether it’s valid or not.
+ */
+OBJC_EXPORT Class _Nullable
+objc_getMetaClass(const char * _Nonnull name)
+ OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns the class definition of a specified class.
+ *
+ * @param name The name of the class to look up.
+ *
+ * @return The Class object for the named class, or \c nil if the class
+ * is not registered with the Objective-C runtime.
+ *
+ * @note \c objc_getClass is different from this function in that if the class is not
+ * registered, \c objc_getClass calls the class handler callback and then checks a second
+ * time to see whether the class is registered. This function does not call the class handler callback.
+ */
+OBJC_EXPORT Class _Nullable
+objc_lookUpClass(const char * _Nonnull name)
+ OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns the class definition of a specified class.
+ *
+ * @param name The name of the class to look up.
+ *
+ * @return The Class object for the named class.
+ *
+ * @note This function is the same as \c objc_getClass, but kills the process if the class is not found.
+ * @note This function is used by ZeroLink, where failing to find a class would be a compile-time link error without ZeroLink.
+ */
+OBJC_EXPORT Class _Nonnull
+objc_getRequiredClass(const char * _Nonnull name)
+ OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Obtains the list of registered class definitions.
+ *
+ * @param buffer An array of \c Class values. On output, each \c Class value points to
+ * one class definition, up to either \e bufferCount or the total number of registered classes,
+ * whichever is less. You can pass \c NULL to obtain the total number of registered class
+ * definitions without actually retrieving any class definitions.
+ * @param bufferCount An integer value. Pass the number of pointers for which you have allocated space
+ * in \e buffer. On return, this function fills in only this number of elements. If this number is less
+ * than the number of registered classes, this function returns an arbitrary subset of the registered classes.
+ *
+ * @return An integer value indicating the total number of registered classes.
+ *
+ * @note The Objective-C runtime library automatically registers all the classes defined in your source code.
+ * You can create class definitions at runtime and register them with the \c objc_addClass function.
+ *
+ * @warning You cannot assume that class objects you get from this function are classes that inherit from \c NSObject,
+ * so you cannot safely call any methods on such classes without detecting that the method is implemented first.
+ */
+OBJC_EXPORT int
+objc_getClassList(Class _Nonnull * _Nullable buffer, int bufferCount)
+ OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Creates and returns a list of pointers to all registered class definitions.
+ *
+ * @param outCount An integer pointer used to store the number of classes returned by
+ * this function in the list. It can be \c nil.
+ *
+ * @return A nil terminated array of classes. It must be freed with \c free().
+ *
+ * @see objc_getClassList
+ */
+OBJC_EXPORT Class _Nonnull * _Nullable
+objc_copyClassList(unsigned int * _Nullable outCount)
+ OBJC_AVAILABLE(10.7, 3.1, 9.0, 1.0, 2.0);
+
+
+/* Working with Classes */
+
+/**
+ * Returns the name of a class.
+ *
+ * @param cls A class object.
+ *
+ * @return The name of the class, or the empty string if \e cls is \c Nil.
+ */
+OBJC_EXPORT const char * _Nonnull
+class_getName(Class _Nullable cls)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns a Boolean value that indicates whether a class object is a metaclass.
+ *
+ * @param cls A class object.
+ *
+ * @return \c YES if \e cls is a metaclass, \c NO if \e cls is a non-meta class,
+ * \c NO if \e cls is \c Nil.
+ */
+OBJC_EXPORT BOOL
+class_isMetaClass(Class _Nullable cls)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns the superclass of a class.
+ *
+ * @param cls A class object.
+ *
+ * @return The superclass of the class, or \c Nil if
+ * \e cls is a root class, or \c Nil if \e cls is \c Nil.
+ *
+ * @note You should usually use \c NSObject's \c superclass method instead of this function.
+ */
+OBJC_EXPORT Class _Nullable
+class_getSuperclass(Class _Nullable cls)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Sets the superclass of a given class.
+ *
+ * @param cls The class whose superclass you want to set.
+ * @param newSuper The new superclass for cls.
+ *
+ * @return The old superclass for cls.
+ *
+ * @warning You should not use this function.
+ */
+OBJC_EXPORT Class _Nonnull
+class_setSuperclass(Class _Nonnull cls, Class _Nonnull newSuper)
+ __OSX_DEPRECATED(10.5, 10.5, "not recommended")
+ __IOS_DEPRECATED(2.0, 2.0, "not recommended")
+ __TVOS_DEPRECATED(9.0, 9.0, "not recommended")
+ __WATCHOS_DEPRECATED(1.0, 1.0, "not recommended")
+#ifndef __APPLE_BLEACH_SDK__
+ __BRIDGEOS_DEPRECATED(2.0, 2.0, "not recommended")
+#endif
+;
+
+/**
+ * Returns the version number of a class definition.
+ *
+ * @param cls A pointer to a \c Class data structure. Pass
+ * the class definition for which you wish to obtain the version.
+ *
+ * @return An integer indicating the version number of the class definition.
+ *
+ * @see class_setVersion
+ */
+OBJC_EXPORT int
+class_getVersion(Class _Nullable cls)
+ OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Sets the version number of a class definition.
+ *
+ * @param cls A pointer to an Class data structure.
+ * Pass the class definition for which you wish to set the version.
+ * @param version An integer. Pass the new version number of the class definition.
+ *
+ * @note You can use the version number of the class definition to provide versioning of the
+ * interface that your class represents to other classes. This is especially useful for object
+ * serialization (that is, archiving of the object in a flattened form), where it is important to
+ * recognize changes to the layout of the instance variables in different class-definition versions.
+ * @note Classes derived from the Foundation framework \c NSObject class can set the class-definition
+ * version number using the \c setVersion: class method, which is implemented using the \c class_setVersion function.
+ */
+OBJC_EXPORT void
+class_setVersion(Class _Nullable cls, int version)
+ OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns the size of instances of a class.
+ *
+ * @param cls A class object.
+ *
+ * @return The size in bytes of instances of the class \e cls, or \c 0 if \e cls is \c Nil.
+ */
+OBJC_EXPORT size_t
+class_getInstanceSize(Class _Nullable cls)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns the \c Ivar for a specified instance variable of a given class.
+ *
+ * @param cls The class whose instance variable you wish to obtain.
+ * @param name The name of the instance variable definition to obtain.
+ *
+ * @return A pointer to an \c Ivar data structure containing information about
+ * the instance variable specified by \e name.
+ */
+OBJC_EXPORT Ivar _Nullable
+class_getInstanceVariable(Class _Nullable cls, const char * _Nonnull name)
+ OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns the Ivar for a specified class variable of a given class.
+ *
+ * @param cls The class definition whose class variable you wish to obtain.
+ * @param name The name of the class variable definition to obtain.
+ *
+ * @return A pointer to an \c Ivar data structure containing information about the class variable specified by \e name.
+ */
+OBJC_EXPORT Ivar _Nullable
+class_getClassVariable(Class _Nullable cls, const char * _Nonnull name)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Describes the instance variables declared by a class.
+ *
+ * @param cls The class to inspect.
+ * @param outCount On return, contains the length of the returned array.
+ * If outCount is NULL, the length is not returned.
+ *
+ * @return An array of pointers of type Ivar describing the instance variables declared by the class.
+ * Any instance variables declared by superclasses are not included. The array contains *outCount
+ * pointers followed by a NULL terminator. You must free the array with free().
+ *
+ * If the class declares no instance variables, or cls is Nil, NULL is returned and *outCount is 0.
+ */
+OBJC_EXPORT Ivar _Nonnull * _Nullable
+class_copyIvarList(Class _Nullable cls, unsigned int * _Nullable outCount)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns a specified instance method for a given class.
+ *
+ * @param cls The class you want to inspect.
+ * @param name The selector of the method you want to retrieve.
+ *
+ * @return The method that corresponds to the implementation of the selector specified by
+ * \e name for the class specified by \e cls, or \c NULL if the specified class or its
+ * superclasses do not contain an instance method with the specified selector.
+ *
+ * @note This function searches superclasses for implementations, whereas \c class_copyMethodList does not.
+ */
+OBJC_EXPORT Method _Nullable
+class_getInstanceMethod(Class _Nullable cls, SEL _Nonnull name)
+ OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns a pointer to the data structure describing a given class method for a given class.
+ *
+ * @param cls A pointer to a class definition. Pass the class that contains the method you want to retrieve.
+ * @param name A pointer of type \c SEL. Pass the selector of the method you want to retrieve.
+ *
+ * @return A pointer to the \c Method data structure that corresponds to the implementation of the
+ * selector specified by aSelector for the class specified by aClass, or NULL if the specified
+ * class or its superclasses do not contain an instance method with the specified selector.
+ *
+ * @note Note that this function searches superclasses for implementations,
+ * whereas \c class_copyMethodList does not.
+ */
+OBJC_EXPORT Method _Nullable
+class_getClassMethod(Class _Nullable cls, SEL _Nonnull name)
+ OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns the function pointer that would be called if a
+ * particular message were sent to an instance of a class.
+ *
+ * @param cls The class you want to inspect.
+ * @param name A selector.
+ *
+ * @return The function pointer that would be called if \c [object name] were called
+ * with an instance of the class, or \c NULL if \e cls is \c Nil.
+ *
+ * @note \c class_getMethodImplementation may be faster than \c method_getImplementation(class_getInstanceMethod(cls, name)).
+ * @note The function pointer returned may be a function internal to the runtime instead of
+ * an actual method implementation. For example, if instances of the class do not respond to
+ * the selector, the function pointer returned will be part of the runtime's message forwarding machinery.
+ */
+OBJC_EXPORT IMP _Nullable
+class_getMethodImplementation(Class _Nullable cls, SEL _Nonnull name)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns the function pointer that would be called if a particular
+ * message were sent to an instance of a class.
+ *
+ * @param cls The class you want to inspect.
+ * @param name A selector.
+ *
+ * @return The function pointer that would be called if \c [object name] were called
+ * with an instance of the class, or \c NULL if \e cls is \c Nil.
+ */
+OBJC_EXPORT IMP _Nullable
+class_getMethodImplementation_stret(Class _Nullable cls, SEL _Nonnull name)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0)
+ OBJC_ARM64_UNAVAILABLE;
+
+/**
+ * Returns a Boolean value that indicates whether instances of a class respond to a particular selector.
+ *
+ * @param cls The class you want to inspect.
+ * @param sel A selector.
+ *
+ * @return \c YES if instances of the class respond to the selector, otherwise \c NO.
+ *
+ * @note You should usually use \c NSObject's \c respondsToSelector: or \c instancesRespondToSelector:
+ * methods instead of this function.
+ */
+OBJC_EXPORT BOOL
+class_respondsToSelector(Class _Nullable cls, SEL _Nonnull sel)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Describes the instance methods implemented by a class.
+ *
+ * @param cls The class you want to inspect.
+ * @param outCount On return, contains the length of the returned array.
+ * If outCount is NULL, the length is not returned.
+ *
+ * @return An array of pointers of type Method describing the instance methods
+ * implemented by the class—any instance methods implemented by superclasses are not included.
+ * The array contains *outCount pointers followed by a NULL terminator. You must free the array with free().
+ *
+ * If cls implements no instance methods, or cls is Nil, returns NULL and *outCount is 0.
+ *
+ * @note To get the class methods of a class, use \c class_copyMethodList(object_getClass(cls), &count).
+ * @note To get the implementations of methods that may be implemented by superclasses,
+ * use \c class_getInstanceMethod or \c class_getClassMethod.
+ */
+OBJC_EXPORT Method _Nonnull * _Nullable
+class_copyMethodList(Class _Nullable cls, unsigned int * _Nullable outCount)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns a Boolean value that indicates whether a class conforms to a given protocol.
+ *
+ * @param cls The class you want to inspect.
+ * @param protocol A protocol.
+ *
+ * @return YES if cls conforms to protocol, otherwise NO.
+ *
+ * @note You should usually use NSObject's conformsToProtocol: method instead of this function.
+ */
+OBJC_EXPORT BOOL
+class_conformsToProtocol(Class _Nullable cls, Protocol * _Nullable protocol)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Describes the protocols adopted by a class.
+ *
+ * @param cls The class you want to inspect.
+ * @param outCount On return, contains the length of the returned array.
+ * If outCount is NULL, the length is not returned.
+ *
+ * @return An array of pointers of type Protocol* describing the protocols adopted
+ * by the class. Any protocols adopted by superclasses or other protocols are not included.
+ * The array contains *outCount pointers followed by a NULL terminator. You must free the array with free().
+ *
+ * If cls adopts no protocols, or cls is Nil, returns NULL and *outCount is 0.
+ */
+OBJC_EXPORT Protocol * __unsafe_unretained _Nonnull * _Nullable
+class_copyProtocolList(Class _Nullable cls, unsigned int * _Nullable outCount)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns a property with a given name of a given class.
+ *
+ * @param cls The class you want to inspect.
+ * @param name The name of the property you want to inspect.
+ *
+ * @return A pointer of type \c objc_property_t describing the property, or
+ * \c NULL if the class does not declare a property with that name,
+ * or \c NULL if \e cls is \c Nil.
+ */
+OBJC_EXPORT objc_property_t _Nullable
+class_getProperty(Class _Nullable cls, const char * _Nonnull name)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Describes the properties declared by a class.
+ *
+ * @param cls The class you want to inspect.
+ * @param outCount On return, contains the length of the returned array.
+ * If \e outCount is \c NULL, the length is not returned.
+ *
+ * @return An array of pointers of type \c objc_property_t describing the properties
+ * declared by the class. Any properties declared by superclasses are not included.
+ * The array contains \c *outCount pointers followed by a \c NULL terminator. You must free the array with \c free().
+ *
+ * If \e cls declares no properties, or \e cls is \c Nil, returns \c NULL and \c *outCount is \c 0.
+ */
+OBJC_EXPORT objc_property_t _Nonnull * _Nullable
+class_copyPropertyList(Class _Nullable cls, unsigned int * _Nullable outCount)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns a description of the \c Ivar layout for a given class.
+ *
+ * @param cls The class to inspect.
+ *
+ * @return A description of the \c Ivar layout for \e cls.
+ */
+OBJC_EXPORT const uint8_t * _Nullable
+class_getIvarLayout(Class _Nullable cls)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns a description of the layout of weak Ivars for a given class.
+ *
+ * @param cls The class to inspect.
+ *
+ * @return A description of the layout of the weak \c Ivars for \e cls.
+ */
+OBJC_EXPORT const uint8_t * _Nullable
+class_getWeakIvarLayout(Class _Nullable cls)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Adds a new method to a class with a given name and implementation.
+ *
+ * @param cls The class to which to add a method.
+ * @param name A selector that specifies the name of the method being added.
+ * @param imp A function which is the implementation of the new method. The function must take at least two arguments—self and _cmd.
+ * @param types An array of characters that describe the types of the arguments to the method.
+ *
+ * @return YES if the method was added successfully, otherwise NO
+ * (for example, the class already contains a method implementation with that name).
+ *
+ * @note class_addMethod will add an override of a superclass's implementation,
+ * but will not replace an existing implementation in this class.
+ * To change an existing implementation, use method_setImplementation.
+ */
+OBJC_EXPORT BOOL
+class_addMethod(Class _Nullable cls, SEL _Nonnull name, IMP _Nonnull imp,
+ const char * _Nullable types)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Replaces the implementation of a method for a given class.
+ *
+ * @param cls The class you want to modify.
+ * @param name A selector that identifies the method whose implementation you want to replace.
+ * @param imp The new implementation for the method identified by name for the class identified by cls.
+ * @param types An array of characters that describe the types of the arguments to the method.
+ * Since the function must take at least two arguments—self and _cmd, the second and third characters
+ * must be “@:” (the first character is the return type).
+ *
+ * @return The previous implementation of the method identified by \e name for the class identified by \e cls.
+ *
+ * @note This function behaves in two different ways:
+ * - If the method identified by \e name does not yet exist, it is added as if \c class_addMethod were called.
+ * The type encoding specified by \e types is used as given.
+ * - If the method identified by \e name does exist, its \c IMP is replaced as if \c method_setImplementation were called.
+ * The type encoding specified by \e types is ignored.
+ */
+OBJC_EXPORT IMP _Nullable
+class_replaceMethod(Class _Nullable cls, SEL _Nonnull name, IMP _Nonnull imp,
+ const char * _Nullable types)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Adds a new instance variable to a class.
+ *
+ * @return YES if the instance variable was added successfully, otherwise NO
+ * (for example, the class already contains an instance variable with that name).
+ *
+ * @note This function may only be called after objc_allocateClassPair and before objc_registerClassPair.
+ * Adding an instance variable to an existing class is not supported.
+ * @note The class must not be a metaclass. Adding an instance variable to a metaclass is not supported.
+ * @note The instance variable's minimum alignment in bytes is 1<<align. The minimum alignment of an instance
+ * variable depends on the ivar's type and the machine architecture.
+ * For variables of any pointer type, pass log2(sizeof(pointer_type)).
+ */
+OBJC_EXPORT BOOL
+class_addIvar(Class _Nullable cls, const char * _Nonnull name, size_t size,
+ uint8_t alignment, const char * _Nullable types)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Adds a protocol to a class.
+ *
+ * @param cls The class to modify.
+ * @param protocol The protocol to add to \e cls.
+ *
+ * @return \c YES if the method was added successfully, otherwise \c NO
+ * (for example, the class already conforms to that protocol).
+ */
+OBJC_EXPORT BOOL
+class_addProtocol(Class _Nullable cls, Protocol * _Nonnull protocol)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Adds a property to a class.
+ *
+ * @param cls The class to modify.
+ * @param name The name of the property.
+ * @param attributes An array of property attributes.
+ * @param attributeCount The number of attributes in \e attributes.
+ *
+ * @return \c YES if the property was added successfully, otherwise \c NO
+ * (for example, the class already has that property).
+ */
+OBJC_EXPORT BOOL
+class_addProperty(Class _Nullable cls, const char * _Nonnull name,
+ const objc_property_attribute_t * _Nullable attributes,
+ unsigned int attributeCount)
+ OBJC_AVAILABLE(10.7, 4.3, 9.0, 1.0, 2.0);
+
+/**
+ * Replace a property of a class.
+ *
+ * @param cls The class to modify.
+ * @param name The name of the property.
+ * @param attributes An array of property attributes.
+ * @param attributeCount The number of attributes in \e attributes.
+ */
+OBJC_EXPORT void
+class_replaceProperty(Class _Nullable cls, const char * _Nonnull name,
+ const objc_property_attribute_t * _Nullable attributes,
+ unsigned int attributeCount)
+ OBJC_AVAILABLE(10.7, 4.3, 9.0, 1.0, 2.0);
+
+/**
+ * Sets the Ivar layout for a given class.
+ *
+ * @param cls The class to modify.
+ * @param layout The layout of the \c Ivars for \e cls.
+ */
+OBJC_EXPORT void
+class_setIvarLayout(Class _Nullable cls, const uint8_t * _Nullable layout)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Sets the layout for weak Ivars for a given class.
+ *
+ * @param cls The class to modify.
+ * @param layout The layout of the weak Ivars for \e cls.
+ */
+OBJC_EXPORT void
+class_setWeakIvarLayout(Class _Nullable cls, const uint8_t * _Nullable layout)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Used by CoreFoundation's toll-free bridging.
+ * Return the id of the named class.
+ *
+ * @return The id of the named class, or an uninitialized class
+ * structure that will be used for the class when and if it does
+ * get loaded.
+ *
+ * @warning Do not call this function yourself.
+ */
+OBJC_EXPORT Class _Nonnull
+objc_getFutureClass(const char * _Nonnull name)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0)
+ OBJC_ARC_UNAVAILABLE;
+
+
+/* Instantiating Classes */
+
+/**
+ * Creates an instance of a class, allocating memory for the class in the
+ * default malloc memory zone.
+ *
+ * @param cls The class that you wish to allocate an instance of.
+ * @param extraBytes An integer indicating the number of extra bytes to allocate.
+ * The additional bytes can be used to store additional instance variables beyond
+ * those defined in the class definition.
+ *
+ * @return An instance of the class \e cls.
+ */
+OBJC_EXPORT id _Nullable
+class_createInstance(Class _Nullable cls, size_t extraBytes)
+ OBJC_RETURNS_RETAINED
+ OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Creates an instance of a class at the specific location provided.
+ *
+ * @param cls The class that you wish to allocate an instance of.
+ * @param bytes The location at which to allocate an instance of \e cls.
+ * Must point to at least \c class_getInstanceSize(cls) bytes of well-aligned,
+ * zero-filled memory.
+ *
+ * @return \e bytes on success, \c nil otherwise. (For example, \e cls or \e bytes
+ * might be \c nil)
+ *
+ * @see class_createInstance
+ */
+OBJC_EXPORT id _Nullable
+objc_constructInstance(Class _Nullable cls, void * _Nullable bytes)
+ OBJC_AVAILABLE(10.6, 3.0, 9.0, 1.0, 2.0)
+ OBJC_ARC_UNAVAILABLE;
+
+/**
+ * Destroys an instance of a class without freeing memory and removes any
+ * associated references this instance might have had.
+ *
+ * @param obj The class instance to destroy.
+ *
+ * @return \e obj. Does nothing if \e obj is nil.
+ *
+ * @note CF and other clients do call this under GC.
+ */
+OBJC_EXPORT void * _Nullable objc_destructInstance(id _Nullable obj)
+ OBJC_AVAILABLE(10.6, 3.0, 9.0, 1.0, 2.0)
+ OBJC_ARC_UNAVAILABLE;
+
+
+/* Adding Classes */
+
+/**
+ * Creates a new class and metaclass.
+ *
+ * @param superclass The class to use as the new class's superclass, or \c Nil to create a new root class.
+ * @param name The string to use as the new class's name. The string will be copied.
+ * @param extraBytes The number of bytes to allocate for indexed ivars at the end of
+ * the class and metaclass objects. This should usually be \c 0.
+ *
+ * @return The new class, or Nil if the class could not be created (for example, the desired name is already in use).
+ *
+ * @note You can get a pointer to the new metaclass by calling \c object_getClass(newClass).
+ * @note To create a new class, start by calling \c objc_allocateClassPair.
+ * Then set the class's attributes with functions like \c class_addMethod and \c class_addIvar.
+ * When you are done building the class, call \c objc_registerClassPair. The new class is now ready for use.
+ * @note Instance methods and instance variables should be added to the class itself.
+ * Class methods should be added to the metaclass.
+ */
+OBJC_EXPORT Class _Nullable
+objc_allocateClassPair(Class _Nullable superclass, const char * _Nonnull name,
+ size_t extraBytes)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Registers a class that was allocated using \c objc_allocateClassPair.
+ *
+ * @param cls The class you want to register.
+ */
+OBJC_EXPORT void
+objc_registerClassPair(Class _Nonnull cls)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Used by Foundation's Key-Value Observing.
+ *
+ * @warning Do not call this function yourself.
+ */
+OBJC_EXPORT Class _Nonnull
+objc_duplicateClass(Class _Nonnull original, const char * _Nonnull name,
+ size_t extraBytes)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Destroy a class and its associated metaclass.
+ *
+ * @param cls The class to be destroyed. It must have been allocated with
+ * \c objc_allocateClassPair
+ *
+ * @warning Do not call if instances of this class or a subclass exist.
+ */
+OBJC_EXPORT void
+objc_disposeClassPair(Class _Nonnull cls)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+
+/* Working with Methods */
+
+/**
+ * Returns the name of a method.
+ *
+ * @param m The method to inspect.
+ *
+ * @return A pointer of type SEL.
+ *
+ * @note To get the method name as a C string, call \c sel_getName(method_getName(method)).
+ */
+OBJC_EXPORT SEL _Nonnull
+method_getName(Method _Nonnull m)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns the implementation of a method.
+ *
+ * @param m The method to inspect.
+ *
+ * @return A function pointer of type IMP.
+ */
+OBJC_EXPORT IMP _Nonnull
+method_getImplementation(Method _Nonnull m)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns a string describing a method's parameter and return types.
+ *
+ * @param m The method to inspect.
+ *
+ * @return A C string. The string may be \c NULL.
+ */
+OBJC_EXPORT const char * _Nullable
+method_getTypeEncoding(Method _Nonnull m)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns the number of arguments accepted by a method.
+ *
+ * @param m A pointer to a \c Method data structure. Pass the method in question.
+ *
+ * @return An integer containing the number of arguments accepted by the given method.
+ */
+OBJC_EXPORT unsigned int
+method_getNumberOfArguments(Method _Nonnull m)
+ OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns a string describing a method's return type.
+ *
+ * @param m The method to inspect.
+ *
+ * @return A C string describing the return type. You must free the string with \c free().
+ */
+OBJC_EXPORT char * _Nonnull
+method_copyReturnType(Method _Nonnull m)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns a string describing a single parameter type of a method.
+ *
+ * @param m The method to inspect.
+ * @param index The index of the parameter to inspect.
+ *
+ * @return A C string describing the type of the parameter at index \e index, or \c NULL
+ * if method has no parameter index \e index. You must free the string with \c free().
+ */
+OBJC_EXPORT char * _Nullable
+method_copyArgumentType(Method _Nonnull m, unsigned int index)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns by reference a string describing a method's return type.
+ *
+ * @param m The method you want to inquire about.
+ * @param dst The reference string to store the description.
+ * @param dst_len The maximum number of characters that can be stored in \e dst.
+ *
+ * @note The method's return type string is copied to \e dst.
+ * \e dst is filled as if \c strncpy(dst, parameter_type, dst_len) were called.
+ */
+OBJC_EXPORT void
+method_getReturnType(Method _Nonnull m, char * _Nonnull dst, size_t dst_len)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns by reference a string describing a single parameter type of a method.
+ *
+ * @param m The method you want to inquire about.
+ * @param index The index of the parameter you want to inquire about.
+ * @param dst The reference string to store the description.
+ * @param dst_len The maximum number of characters that can be stored in \e dst.
+ *
+ * @note The parameter type string is copied to \e dst. \e dst is filled as if \c strncpy(dst, parameter_type, dst_len)
+ * were called. If the method contains no parameter with that index, \e dst is filled as
+ * if \c strncpy(dst, "", dst_len) were called.
+ */
+OBJC_EXPORT void
+method_getArgumentType(Method _Nonnull m, unsigned int index,
+ char * _Nullable dst, size_t dst_len)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+OBJC_EXPORT struct objc_method_description * _Nonnull
+method_getDescription(Method _Nonnull m)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Sets the implementation of a method.
+ *
+ * @param m The method for which to set an implementation.
+ * @param imp The implemention to set to this method.
+ *
+ * @return The previous implementation of the method.
+ */
+OBJC_EXPORT IMP _Nonnull
+method_setImplementation(Method _Nonnull m, IMP _Nonnull imp)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Exchanges the implementations of two methods.
+ *
+ * @param m1 Method to exchange with second method.
+ * @param m2 Method to exchange with first method.
+ *
+ * @note This is an atomic version of the following:
+ * \code
+ * IMP imp1 = method_getImplementation(m1);
+ * IMP imp2 = method_getImplementation(m2);
+ * method_setImplementation(m1, imp2);
+ * method_setImplementation(m2, imp1);
+ * \endcode
+ */
+OBJC_EXPORT void
+method_exchangeImplementations(Method _Nonnull m1, Method _Nonnull m2)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+
+/* Working with Instance Variables */
+
+/**
+ * Returns the name of an instance variable.
+ *
+ * @param v The instance variable you want to enquire about.
+ *
+ * @return A C string containing the instance variable's name.
+ */
+OBJC_EXPORT const char * _Nullable
+ivar_getName(Ivar _Nonnull v)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns the type string of an instance variable.
+ *
+ * @param v The instance variable you want to enquire about.
+ *
+ * @return A C string containing the instance variable's type encoding.
+ *
+ * @note For possible values, see Objective-C Runtime Programming Guide > Type Encodings.
+ */
+OBJC_EXPORT const char * _Nullable
+ivar_getTypeEncoding(Ivar _Nonnull v)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns the offset of an instance variable.
+ *
+ * @param v The instance variable you want to enquire about.
+ *
+ * @return The offset of \e v.
+ *
+ * @note For instance variables of type \c id or other object types, call \c object_getIvar
+ * and \c object_setIvar instead of using this offset to access the instance variable data directly.
+ */
+OBJC_EXPORT ptrdiff_t
+ivar_getOffset(Ivar _Nonnull v)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+
+/* Working with Properties */
+
+/**
+ * Returns the name of a property.
+ *
+ * @param property The property you want to inquire about.
+ *
+ * @return A C string containing the property's name.
+ */
+OBJC_EXPORT const char * _Nonnull
+property_getName(objc_property_t _Nonnull property)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns the attribute string of a property.
+ *
+ * @param property A property.
+ *
+ * @return A C string containing the property's attributes.
+ *
+ * @note The format of the attribute string is described in Declared Properties in Objective-C Runtime Programming Guide.
+ */
+OBJC_EXPORT const char * _Nullable
+property_getAttributes(objc_property_t _Nonnull property)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns an array of property attributes for a property.
+ *
+ * @param property The property whose attributes you want copied.
+ * @param outCount The number of attributes returned in the array.
+ *
+ * @return An array of property attributes; must be free'd() by the caller.
+ */
+OBJC_EXPORT objc_property_attribute_t * _Nullable
+property_copyAttributeList(objc_property_t _Nonnull property,
+ unsigned int * _Nullable outCount)
+ OBJC_AVAILABLE(10.7, 4.3, 9.0, 1.0, 2.0);
+
+/**
+ * Returns the value of a property attribute given the attribute name.
+ *
+ * @param property The property whose attribute value you are interested in.
+ * @param attributeName C string representing the attribute name.
+ *
+ * @return The value string of the attribute \e attributeName if it exists in
+ * \e property, \c nil otherwise.
+ */
+OBJC_EXPORT char * _Nullable
+property_copyAttributeValue(objc_property_t _Nonnull property,
+ const char * _Nonnull attributeName)
+ OBJC_AVAILABLE(10.7, 4.3, 9.0, 1.0, 2.0);
+
+
+/* Working with Protocols */
+
+/**
+ * Returns a specified protocol.
+ *
+ * @param name The name of a protocol.
+ *
+ * @return The protocol named \e name, or \c NULL if no protocol named \e name could be found.
+ *
+ * @note This function acquires the runtime lock.
+ */
+OBJC_EXPORT Protocol * _Nullable
+objc_getProtocol(const char * _Nonnull name)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns an array of all the protocols known to the runtime.
+ *
+ * @param outCount Upon return, contains the number of protocols in the returned array.
+ *
+ * @return A C array of all the protocols known to the runtime. The array contains \c *outCount
+ * pointers followed by a \c NULL terminator. You must free the list with \c free().
+ *
+ * @note This function acquires the runtime lock.
+ */
+OBJC_EXPORT Protocol * __unsafe_unretained _Nonnull * _Nullable
+objc_copyProtocolList(unsigned int * _Nullable outCount)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns a Boolean value that indicates whether one protocol conforms to another protocol.
+ *
+ * @param proto A protocol.
+ * @param other A protocol.
+ *
+ * @return \c YES if \e proto conforms to \e other, otherwise \c NO.
+ *
+ * @note One protocol can incorporate other protocols using the same syntax
+ * that classes use to adopt a protocol:
+ * \code
+ * @protocol ProtocolName < protocol list >
+ * \endcode
+ * All the protocols listed between angle brackets are considered part of the ProtocolName protocol.
+ */
+OBJC_EXPORT BOOL
+protocol_conformsToProtocol(Protocol * _Nullable proto,
+ Protocol * _Nullable other)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns a Boolean value that indicates whether two protocols are equal.
+ *
+ * @param proto A protocol.
+ * @param other A protocol.
+ *
+ * @return \c YES if \e proto is the same as \e other, otherwise \c NO.
+ */
+OBJC_EXPORT BOOL
+protocol_isEqual(Protocol * _Nullable proto, Protocol * _Nullable other)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns the name of a protocol.
+ *
+ * @param proto A protocol.
+ *
+ * @return The name of the protocol \e p as a C string.
+ */
+OBJC_EXPORT const char * _Nonnull
+protocol_getName(Protocol * _Nonnull proto)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns a method description structure for a specified method of a given protocol.
+ *
+ * @param proto A protocol.
+ * @param aSel A selector.
+ * @param isRequiredMethod A Boolean value that indicates whether aSel is a required method.
+ * @param isInstanceMethod A Boolean value that indicates whether aSel is an instance method.
+ *
+ * @return An \c objc_method_description structure that describes the method specified by \e aSel,
+ * \e isRequiredMethod, and \e isInstanceMethod for the protocol \e p.
+ * If the protocol does not contain the specified method, returns an \c objc_method_description structure
+ * with the value \c {NULL, \c NULL}.
+ *
+ * @note This function recursively searches any protocols that this protocol conforms to.
+ */
+OBJC_EXPORT struct objc_method_description
+protocol_getMethodDescription(Protocol * _Nonnull proto, SEL _Nonnull aSel,
+ BOOL isRequiredMethod, BOOL isInstanceMethod)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns an array of method descriptions of methods meeting a given specification for a given protocol.
+ *
+ * @param proto A protocol.
+ * @param isRequiredMethod A Boolean value that indicates whether returned methods should
+ * be required methods (pass YES to specify required methods).
+ * @param isInstanceMethod A Boolean value that indicates whether returned methods should
+ * be instance methods (pass YES to specify instance methods).
+ * @param outCount Upon return, contains the number of method description structures in the returned array.
+ *
+ * @return A C array of \c objc_method_description structures containing the names and types of \e p's methods
+ * specified by \e isRequiredMethod and \e isInstanceMethod. The array contains \c *outCount pointers followed
+ * by a \c NULL terminator. You must free the list with \c free().
+ * If the protocol declares no methods that meet the specification, \c NULL is returned and \c *outCount is 0.
+ *
+ * @note Methods in other protocols adopted by this protocol are not included.
+ */
+OBJC_EXPORT struct objc_method_description * _Nullable
+protocol_copyMethodDescriptionList(Protocol * _Nonnull proto,
+ BOOL isRequiredMethod,
+ BOOL isInstanceMethod,
+ unsigned int * _Nullable outCount)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns the specified property of a given protocol.
+ *
+ * @param proto A protocol.
+ * @param name The name of a property.
+ * @param isRequiredProperty \c YES searches for a required property, \c NO searches for an optional property.
+ * @param isInstanceProperty \c YES searches for an instance property, \c NO searches for a class property.
+ *
+ * @return The property specified by \e name, \e isRequiredProperty, and \e isInstanceProperty for \e proto,
+ * or \c NULL if none of \e proto's properties meets the specification.
+ */
+OBJC_EXPORT objc_property_t _Nullable
+protocol_getProperty(Protocol * _Nonnull proto,
+ const char * _Nonnull name,
+ BOOL isRequiredProperty, BOOL isInstanceProperty)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns an array of the required instance properties declared by a protocol.
+ *
+ * @note Identical to
+ * \code
+ * protocol_copyPropertyList2(proto, outCount, YES, YES);
+ * \endcode
+ */
+OBJC_EXPORT objc_property_t _Nonnull * _Nullable
+protocol_copyPropertyList(Protocol * _Nonnull proto,
+ unsigned int * _Nullable outCount)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns an array of properties declared by a protocol.
+ *
+ * @param proto A protocol.
+ * @param outCount Upon return, contains the number of elements in the returned array.
+ * @param isRequiredProperty \c YES returns required properties, \c NO returns optional properties.
+ * @param isInstanceProperty \c YES returns instance properties, \c NO returns class properties.
+ *
+ * @return A C array of pointers of type \c objc_property_t describing the properties declared by \e proto.
+ * Any properties declared by other protocols adopted by this protocol are not included. The array contains
+ * \c *outCount pointers followed by a \c NULL terminator. You must free the array with \c free().
+ * If the protocol declares no matching properties, \c NULL is returned and \c *outCount is \c 0.
+ */
+OBJC_EXPORT objc_property_t _Nonnull * _Nullable
+protocol_copyPropertyList2(Protocol * _Nonnull proto,
+ unsigned int * _Nullable outCount,
+ BOOL isRequiredProperty, BOOL isInstanceProperty)
+ OBJC_AVAILABLE(10.12, 10.0, 10.0, 3.0, 2.0);
+
+/**
+ * Returns an array of the protocols adopted by a protocol.
+ *
+ * @param proto A protocol.
+ * @param outCount Upon return, contains the number of elements in the returned array.
+ *
+ * @return A C array of protocols adopted by \e proto. The array contains \e *outCount pointers
+ * followed by a \c NULL terminator. You must free the array with \c free().
+ * If the protocol adopts no other protocols, \c NULL is returned and \c *outCount is \c 0.
+ */
+OBJC_EXPORT Protocol * __unsafe_unretained _Nonnull * _Nullable
+protocol_copyProtocolList(Protocol * _Nonnull proto,
+ unsigned int * _Nullable outCount)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Creates a new protocol instance that cannot be used until registered with
+ * \c objc_registerProtocol()
+ *
+ * @param name The name of the protocol to create.
+ *
+ * @return The Protocol instance on success, \c nil if a protocol
+ * with the same name already exists.
+ * @note There is no dispose method for this.
+ */
+OBJC_EXPORT Protocol * _Nullable
+objc_allocateProtocol(const char * _Nonnull name)
+ OBJC_AVAILABLE(10.7, 4.3, 9.0, 1.0, 2.0);
+
+/**
+ * Registers a newly constructed protocol with the runtime. The protocol
+ * will be ready for use and is immutable after this.
+ *
+ * @param proto The protocol you want to register.
+ */
+OBJC_EXPORT void
+objc_registerProtocol(Protocol * _Nonnull proto)
+ OBJC_AVAILABLE(10.7, 4.3, 9.0, 1.0, 2.0);
+
+/**
+ * Adds a method to a protocol. The protocol must be under construction.
+ *
+ * @param proto The protocol to add a method to.
+ * @param name The name of the method to add.
+ * @param types A C string that represents the method signature.
+ * @param isRequiredMethod YES if the method is not an optional method.
+ * @param isInstanceMethod YES if the method is an instance method.
+ */
+OBJC_EXPORT void
+protocol_addMethodDescription(Protocol * _Nonnull proto, SEL _Nonnull name,
+ const char * _Nullable types,
+ BOOL isRequiredMethod, BOOL isInstanceMethod)
+ OBJC_AVAILABLE(10.7, 4.3, 9.0, 1.0, 2.0);
+
+/**
+ * Adds an incorporated protocol to another protocol. The protocol being
+ * added to must still be under construction, while the additional protocol
+ * must be already constructed.
+ *
+ * @param proto The protocol you want to add to, it must be under construction.
+ * @param addition The protocol you want to incorporate into \e proto, it must be registered.
+ */
+OBJC_EXPORT void
+protocol_addProtocol(Protocol * _Nonnull proto, Protocol * _Nonnull addition)
+ OBJC_AVAILABLE(10.7, 4.3, 9.0, 1.0, 2.0);
+
+/**
+ * Adds a property to a protocol. The protocol must be under construction.
+ *
+ * @param proto The protocol to add a property to.
+ * @param name The name of the property.
+ * @param attributes An array of property attributes.
+ * @param attributeCount The number of attributes in \e attributes.
+ * @param isRequiredProperty YES if the property (accessor methods) is not optional.
+ * @param isInstanceProperty YES if the property (accessor methods) are instance methods.
+ * This is the only case allowed fo a property, as a result, setting this to NO will
+ * not add the property to the protocol at all.
+ */
+OBJC_EXPORT void
+protocol_addProperty(Protocol * _Nonnull proto, const char * _Nonnull name,
+ const objc_property_attribute_t * _Nullable attributes,
+ unsigned int attributeCount,
+ BOOL isRequiredProperty, BOOL isInstanceProperty)
+ OBJC_AVAILABLE(10.7, 4.3, 9.0, 1.0, 2.0);
+
+
+/* Working with Libraries */
+
+/**
+ * Returns the names of all the loaded Objective-C frameworks and dynamic
+ * libraries.
+ *
+ * @param outCount The number of names returned.
+ *
+ * @return An array of C strings of names. Must be free()'d by caller.
+ */
+OBJC_EXPORT const char * _Nonnull * _Nonnull
+objc_copyImageNames(unsigned int * _Nullable outCount)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns the dynamic library name a class originated from.
+ *
+ * @param cls The class you are inquiring about.
+ *
+ * @return The name of the library containing this class.
+ */
+OBJC_EXPORT const char * _Nullable
+class_getImageName(Class _Nullable cls)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns the names of all the classes within a library.
+ *
+ * @param image The library or framework you are inquiring about.
+ * @param outCount The number of class names returned.
+ *
+ * @return An array of C strings representing the class names.
+ */
+OBJC_EXPORT const char * _Nonnull * _Nullable
+objc_copyClassNamesForImage(const char * _Nonnull image,
+ unsigned int * _Nullable outCount)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+
+/* Working with Selectors */
+
+/**
+ * Returns the name of the method specified by a given selector.
+ *
+ * @param sel A pointer of type \c SEL. Pass the selector whose name you wish to determine.
+ *
+ * @return A C string indicating the name of the selector.
+ */
+OBJC_EXPORT const char * _Nonnull
+sel_getName(SEL _Nonnull sel)
+ OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);
+
+
+/**
+ * Registers a method with the Objective-C runtime system, maps the method
+ * name to a selector, and returns the selector value.
+ *
+ * @param str A pointer to a C string. Pass the name of the method you wish to register.
+ *
+ * @return A pointer of type SEL specifying the selector for the named method.
+ *
+ * @note You must register a method name with the Objective-C runtime system to obtain the
+ * method’s selector before you can add the method to a class definition. If the method name
+ * has already been registered, this function simply returns the selector.
+ */
+OBJC_EXPORT SEL _Nonnull
+sel_registerName(const char * _Nonnull str)
+ OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Returns a Boolean value that indicates whether two selectors are equal.
+ *
+ * @param lhs The selector to compare with rhs.
+ * @param rhs The selector to compare with lhs.
+ *
+ * @return \c YES if \e lhs and \e rhs are equal, otherwise \c NO.
+ *
+ * @note sel_isEqual is equivalent to ==.
+ */
+OBJC_EXPORT BOOL
+sel_isEqual(SEL _Nonnull lhs, SEL _Nonnull rhs)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+
+/* Objective-C Language Features */
+
+/**
+ * This function is inserted by the compiler when a mutation
+ * is detected during a foreach iteration. It gets called
+ * when a mutation occurs, and the enumerationMutationHandler
+ * is enacted if it is set up. A fatal error occurs if a handler is not set up.
+ *
+ * @param obj The object being mutated.
+ *
+ */
+OBJC_EXPORT void
+objc_enumerationMutation(id _Nonnull obj)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Sets the current mutation handler.
+ *
+ * @param handler Function pointer to the new mutation handler.
+ */
+OBJC_EXPORT void
+objc_setEnumerationMutationHandler(void (*_Nullable handler)(id _Nonnull ))
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Set the function to be called by objc_msgForward.
+ *
+ * @param fwd Function to be jumped to by objc_msgForward.
+ * @param fwd_stret Function to be jumped to by objc_msgForward_stret.
+ *
+ * @see message.h::_objc_msgForward
+ */
+OBJC_EXPORT void
+objc_setForwardHandler(void * _Nonnull fwd, void * _Nonnull fwd_stret)
+ OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
+
+/**
+ * Creates a pointer to a function that will call the block
+ * when the method is called.
+ *
+ * @param block The block that implements this method. Its signature should
+ * be: method_return_type ^(id self, method_args...).
+ * The selector is not available as a parameter to this block.
+ * The block is copied with \c Block_copy().
+ *
+ * @return The IMP that calls this block. Must be disposed of with
+ * \c imp_removeBlock.
+ */
+OBJC_EXPORT IMP _Nonnull
+imp_implementationWithBlock(id _Nonnull block)
+ OBJC_AVAILABLE(10.7, 4.3, 9.0, 1.0, 2.0);
+
+/**
+ * Return the block associated with an IMP that was created using
+ * \c imp_implementationWithBlock.
+ *
+ * @param anImp The IMP that calls this block.
+ *
+ * @return The block called by \e anImp.
+ */
+OBJC_EXPORT id _Nullable
+imp_getBlock(IMP _Nonnull anImp)
+ OBJC_AVAILABLE(10.7, 4.3, 9.0, 1.0, 2.0);
+
+/**
+ * Disassociates a block from an IMP that was created using
+ * \c imp_implementationWithBlock and releases the copy of the
+ * block that was created.
+ *
+ * @param anImp An IMP that was created using \c imp_implementationWithBlock.
+ *
+ * @return YES if the block was released successfully, NO otherwise.
+ * (For example, the block might not have been used to create an IMP previously).
+ */
+OBJC_EXPORT BOOL
+imp_removeBlock(IMP _Nonnull anImp)
+ OBJC_AVAILABLE(10.7, 4.3, 9.0, 1.0, 2.0);
+
+/**
+ * This loads the object referenced by a weak pointer and returns it, after
+ * retaining and autoreleasing the object to ensure that it stays alive
+ * long enough for the caller to use it. This function would be used
+ * anywhere a __weak variable is used in an expression.
+ *
+ * @param location The weak pointer address
+ *
+ * @return The object pointed to by \e location, or \c nil if \e *location is \c nil.
+ */
+OBJC_EXPORT id _Nullable
+objc_loadWeak(id _Nullable * _Nonnull location)
+ OBJC_AVAILABLE(10.7, 5.0, 9.0, 1.0, 2.0);
+
+/**
+ * This function stores a new value into a __weak variable. It would
+ * be used anywhere a __weak variable is the target of an assignment.
+ *
+ * @param location The address of the weak pointer itself
+ * @param obj The new object this weak ptr should now point to
+ *
+ * @return The value stored into \e location, i.e. \e obj
+ */
+OBJC_EXPORT id _Nullable
+objc_storeWeak(id _Nullable * _Nonnull location, id _Nullable obj)
+ OBJC_AVAILABLE(10.7, 5.0, 9.0, 1.0, 2.0);
+
+
+/* Associative References */
+
+/**
+ * Policies related to associative references.
+ * These are options to objc_setAssociatedObject()
+ */
+typedef OBJC_ENUM(uintptr_t, objc_AssociationPolicy) {
+ OBJC_ASSOCIATION_ASSIGN = 0, /**< Specifies a weak reference to the associated object. */
+ OBJC_ASSOCIATION_RETAIN_NONATOMIC = 1, /**< Specifies a strong reference to the associated object.
+ * The association is not made atomically. */
+ OBJC_ASSOCIATION_COPY_NONATOMIC = 3, /**< Specifies that the associated object is copied.
+ * The association is not made atomically. */
+ OBJC_ASSOCIATION_RETAIN = 01401, /**< Specifies a strong reference to the associated object.
+ * The association is made atomically. */
+ OBJC_ASSOCIATION_COPY = 01403 /**< Specifies that the associated object is copied.
+ * The association is made atomically. */
};
-typedef uintptr_t objc_AssociationPolicy;
-OBJC_EXPORT void objc_setAssociatedObject(id object, void *key, id value, objc_AssociationPolicy policy)
- AVAILABLE_MAC_OS_X_VERSION_10_6_AND_LATER;
-OBJC_EXPORT id objc_getAssociatedObject(id object, void *key)
- AVAILABLE_MAC_OS_X_VERSION_10_6_AND_LATER;
-OBJC_EXPORT void objc_removeAssociatedObjects(id object)
- AVAILABLE_MAC_OS_X_VERSION_10_6_AND_LATER;
+/**
+ * Sets an associated value for a given object using a given key and association policy.
+ *
+ * @param object The source object for the association.
+ * @param key The key for the association.
+ * @param value The value to associate with the key key for object. Pass nil to clear an existing association.
+ * @param policy The policy for the association. For possible values, see “Associative Object Behaviors.”
+ *
+ * @see objc_setAssociatedObject
+ * @see objc_removeAssociatedObjects
+ */
+OBJC_EXPORT void
+objc_setAssociatedObject(id _Nonnull object, const void * _Nonnull key,
+ id _Nullable value, objc_AssociationPolicy policy)
+ OBJC_AVAILABLE(10.6, 3.1, 9.0, 1.0, 2.0);
+
+/**
+ * Returns the value associated with a given object for a given key.
+ *
+ * @param object The source object for the association.
+ * @param key The key for the association.
+ *
+ * @return The value associated with the key \e key for \e object.
+ *
+ * @see objc_setAssociatedObject
+ */
+OBJC_EXPORT id _Nullable
+objc_getAssociatedObject(id _Nonnull object, const void * _Nonnull key)
+ OBJC_AVAILABLE(10.6, 3.1, 9.0, 1.0, 2.0);
+
+/**
+ * Removes all associations for a given object.
+ *
+ * @param object An object that maintains associated objects.
+ *
+ * @note The main purpose of this function is to make it easy to return an object
+ * to a "pristine state”. You should not use this function for general removal of
+ * associations from objects, since it also removes associations that other clients
+ * may have added to the object. Typically you should use \c objc_setAssociatedObject
+ * with a nil value to clear an association.
+ *
+ * @see objc_setAssociatedObject
+ * @see objc_getAssociatedObject
+ */
+OBJC_EXPORT void
+objc_removeAssociatedObjects(id _Nonnull object)
+ OBJC_AVAILABLE(10.6, 3.1, 9.0, 1.0, 2.0);
+
+
+/* Hooks for Swift */
+
+/**
+ * Function type for a hook that intercepts class_getImageName().
+ *
+ * @param cls The class whose image name is being looked up.
+ * @param outImageName On return, the result of the image name lookup.
+ * @return YES if an image name for this class was found, NO otherwise.
+ *
+ * @see class_getImageName
+ * @see objc_setHook_getImageName
+ */
+typedef BOOL (*objc_hook_getImageName)(Class _Nonnull cls, const char * _Nullable * _Nonnull outImageName);
+
+/**
+ * Install a hook for class_getImageName().
+ *
+ * @param newValue The hook function to install.
+ * @param outOldValue The address of a function pointer variable. On return,
+ * the old hook function is stored in the variable.
+ *
+ * @note The store to *outOldValue is thread-safe: the variable will be
+ * updated before class_getImageName() calls your new hook to read it,
+ * even if your new hook is called from another thread before this
+ * setter completes.
+ * @note The first hook in the chain is the native implementation of
+ * class_getImageName(). Your hook should call the previous hook for
+ * classes that you do not recognize.
+ *
+ * @see class_getImageName
+ * @see objc_hook_getImageName
+ */
+OBJC_EXPORT void objc_setHook_getImageName(objc_hook_getImageName _Nonnull newValue,
+ objc_hook_getImageName _Nullable * _Nonnull outOldValue)
+ OBJC_AVAILABLE(10.14, 12.0, 12.0, 5.0, 3.0);
+
+/**
+ * Function type for a hook that assists objc_getClass() and related functions.
+ *
+ * @param name The class name to look up.
+ * @param outClass On return, the result of the class lookup.
+ * @return YES if a class with this name was found, NO otherwise.
+ *
+ * @see objc_getClass
+ * @see objc_setHook_getClass
+ */
+typedef BOOL (*objc_hook_getClass)(const char * _Nonnull name, Class _Nullable * _Nonnull outClass);
+
+/**
+ * Install a hook for objc_getClass() and related functions.
+ *
+ * @param newValue The hook function to install.
+ * @param outOldValue The address of a function pointer variable. On return,
+ * the old hook function is stored in the variable.
+ *
+ * @note The store to *outOldValue is thread-safe: the variable will be
+ * updated before objc_getClass() calls your new hook to read it,
+ * even if your new hook is called from another thread before this
+ * setter completes.
+ * @note Your hook should call the previous hook for class names
+ * that you do not recognize.
+ *
+ * @see objc_getClass
+ * @see objc_hook_getClass
+ */
+#if !(TARGET_OS_OSX && __i386__)
+#define OBJC_GETCLASSHOOK_DEFINED 1
+OBJC_EXPORT void objc_setHook_getClass(objc_hook_getClass _Nonnull newValue,
+ objc_hook_getClass _Nullable * _Nonnull outOldValue)
+ OBJC_AVAILABLE(10.14.4, 12.2, 12.2, 5.2, 3.2);
+#endif
+
+/**
+ * Function type for a function that is called when an image is loaded.
+ *
+ * @param header The newly loaded header.
+ */
+struct mach_header;
+typedef void (*objc_func_loadImage)(const struct mach_header * _Nonnull header);
+
+/**
+ * Add a function to be called when a new image is loaded. The function is
+ * called after ObjC has scanned and fixed up the image. It is called
+ * BEFORE +load methods are invoked.
+ *
+ * When adding a new function, that function is immediately called with all
+ * images that are currently loaded. It is then called as needed for images
+ * that are loaded afterwards.
+ *
+ * Note: the function is called with ObjC's internal runtime lock held.
+ * Be VERY careful with what the function does to avoid deadlocks or
+ * poor performance.
+ *
+ * @param func The function to add.
+ */
+#define OBJC_ADDLOADIMAGEFUNC_DEFINED 1
+OBJC_EXPORT void objc_addLoadImageFunc(objc_func_loadImage _Nonnull func)
+ OBJC_AVAILABLE(10.15, 13.0, 13.0, 6.0, 4.0);
+
+/**
+ * Function type for a hook that provides a name for lazily named classes.
+ *
+ * @param cls The class to generate a name for.
+ * @return The name of the class, or NULL if the name isn't known or can't me generated.
+ *
+ * @see objc_setHook_lazyClassNamer
+ */
+typedef const char * _Nullable (*objc_hook_lazyClassNamer)(_Nonnull Class cls);
+
+/**
+ * Install a hook to provide a name for lazily-named classes.
+ *
+ * @param newValue The hook function to install.
+ * @param outOldValue The address of a function pointer variable. On return,
+ * the old hook function is stored in the variable.
+ *
+ * @note The store to *outOldValue is thread-safe: the variable will be
+ * updated before objc_getClass() calls your new hook to read it,
+ * even if your new hook is called from another thread before this
+ * setter completes.
+ * @note Your hook must call the previous hook for class names
+ * that you do not recognize.
+ */
+#if !(TARGET_OS_OSX && __i386__)
+#define OBJC_SETHOOK_LAZYCLASSNAMER_DEFINED 1
+OBJC_EXPORT
+void objc_setHook_lazyClassNamer(_Nonnull objc_hook_lazyClassNamer newValue,
+ _Nonnull objc_hook_lazyClassNamer * _Nonnull oldOutValue)
+ OBJC_AVAILABLE(10.16, 14.0, 14.0, 7.0, 5.0);
+#endif
+
+/**
+ * Callback from Objective-C to Swift to perform Swift class initialization.
+ */
+#if !(TARGET_OS_OSX && __i386__)
+typedef Class _Nullable
+(*_objc_swiftMetadataInitializer)(Class _Nonnull cls, void * _Nullable arg);
+#endif
+
+
+/**
+ * Perform Objective-C initialization of a Swift class.
+ * Do not call this function. It is provided for the Swift runtime's use only
+ * and will change without notice or mercy.
+ */
+#if !(TARGET_OS_OSX && __i386__)
+#define OBJC_REALIZECLASSFROMSWIFT_DEFINED 1
+OBJC_EXPORT Class _Nullable
+_objc_realizeClassFromSwift(Class _Nullable cls, void * _Nullable previously)
+ OBJC_AVAILABLE(10.14.4, 12.2, 12.2, 5.2, 3.2);
+#endif
#define _C_ID '@'
struct objc_method_description_list {
- int count;
- struct objc_method_description list[1];
+ int count;
+ struct objc_method_description list[1];
};
struct objc_protocol_list {
- struct objc_protocol_list *next;
+ struct objc_protocol_list * _Nullable next;
long count;
- Protocol *list[1];
+ __unsafe_unretained Protocol * _Nullable list[1];
};
struct objc_category {
- char *category_name OBJC2_UNAVAILABLE;
- char *class_name OBJC2_UNAVAILABLE;
- struct objc_method_list *instance_methods OBJC2_UNAVAILABLE;
- struct objc_method_list *class_methods OBJC2_UNAVAILABLE;
- struct objc_protocol_list *protocols OBJC2_UNAVAILABLE;
+ char * _Nonnull category_name OBJC2_UNAVAILABLE;
+ char * _Nonnull class_name OBJC2_UNAVAILABLE;
+ struct objc_method_list * _Nullable instance_methods OBJC2_UNAVAILABLE;
+ struct objc_method_list * _Nullable class_methods OBJC2_UNAVAILABLE;
+ struct objc_protocol_list * _Nullable protocols OBJC2_UNAVAILABLE;
} OBJC2_UNAVAILABLE;
struct objc_ivar {
- char *ivar_name OBJC2_UNAVAILABLE;
- char *ivar_type OBJC2_UNAVAILABLE;
+ char * _Nullable ivar_name OBJC2_UNAVAILABLE;
+ char * _Nullable ivar_type OBJC2_UNAVAILABLE;
int ivar_offset OBJC2_UNAVAILABLE;
#ifdef __LP64__
int space OBJC2_UNAVAILABLE;
struct objc_method {
- SEL method_name OBJC2_UNAVAILABLE;
- char *method_types OBJC2_UNAVAILABLE;
- IMP method_imp OBJC2_UNAVAILABLE;
+ SEL _Nonnull method_name OBJC2_UNAVAILABLE;
+ char * _Nullable method_types OBJC2_UNAVAILABLE;
+ IMP _Nonnull method_imp OBJC2_UNAVAILABLE;
} OBJC2_UNAVAILABLE;
struct objc_method_list {
- struct objc_method_list *obsolete OBJC2_UNAVAILABLE;
+ struct objc_method_list * _Nullable obsolete OBJC2_UNAVAILABLE;
int method_count OBJC2_UNAVAILABLE;
#ifdef __LP64__
struct objc_symtab {
unsigned long sel_ref_cnt OBJC2_UNAVAILABLE;
- SEL *refs OBJC2_UNAVAILABLE;
+ SEL _Nonnull * _Nullable refs OBJC2_UNAVAILABLE;
unsigned short cls_def_cnt OBJC2_UNAVAILABLE;
unsigned short cat_def_cnt OBJC2_UNAVAILABLE;
- void *defs[1] /* variable size */ OBJC2_UNAVAILABLE;
+ void * _Nullable defs[1] /* variable size */ OBJC2_UNAVAILABLE;
} OBJC2_UNAVAILABLE;
struct objc_cache {
unsigned int mask /* total = mask + 1 */ OBJC2_UNAVAILABLE;
unsigned int occupied OBJC2_UNAVAILABLE;
- Method buckets[1] OBJC2_UNAVAILABLE;
-} /* GrP fixme should be OBJC2_UNAVAILABLE, but isn't because of spurious warnings in [super ...] calls */;
+ Method _Nullable buckets[1] OBJC2_UNAVAILABLE;
+};
typedef struct objc_module *Module OBJC2_UNAVAILABLE;
struct objc_module {
unsigned long version OBJC2_UNAVAILABLE;
unsigned long size OBJC2_UNAVAILABLE;
- const char *name OBJC2_UNAVAILABLE;
- Symtab symtab OBJC2_UNAVAILABLE;
+ const char * _Nullable name OBJC2_UNAVAILABLE;
+ Symtab _Nullable symtab OBJC2_UNAVAILABLE;
} OBJC2_UNAVAILABLE;
#else
/* Obsolete functions */
-OBJC_EXPORT BOOL sel_isMapped(SEL sel) OBJC2_UNAVAILABLE;
-
-OBJC_EXPORT id object_copyFromZone(id anObject, size_t nBytes, void *z) DEPRECATED_IN_MAC_OS_X_VERSION_10_5_AND_LATER;
-OBJC_EXPORT id object_realloc(id anObject, size_t nBytes) OBJC2_UNAVAILABLE;
-OBJC_EXPORT id object_reallocFromZone(id anObject, size_t nBytes, void *z) OBJC2_UNAVAILABLE;
-
-#define OBSOLETE_OBJC_GETCLASSES 1
-OBJC_EXPORT void *objc_getClasses(void) OBJC2_UNAVAILABLE;
-OBJC_EXPORT void objc_addClass(Class myClass) OBJC2_UNAVAILABLE;
-OBJC_EXPORT void objc_setClassHandler(int (*)(const char *)) OBJC2_UNAVAILABLE;
-OBJC_EXPORT void objc_setMultithreaded (BOOL flag) OBJC2_UNAVAILABLE;
+OBJC_EXPORT IMP _Nullable
+class_lookupMethod(Class _Nullable cls, SEL _Nonnull sel)
+ __OSX_DEPRECATED(10.0, 10.5, "use class_getMethodImplementation instead")
+ __IOS_DEPRECATED(2.0, 2.0, "use class_getMethodImplementation instead")
+ __TVOS_DEPRECATED(9.0, 9.0, "use class_getMethodImplementation instead")
+ __WATCHOS_DEPRECATED(1.0, 1.0, "use class_getMethodImplementation instead")
+#ifndef __APPLE_BLEACH_SDK__
+ __BRIDGEOS_DEPRECATED(2.0, 2.0, "use class_getMethodImplementation instead")
+#endif
+;
+OBJC_EXPORT BOOL
+class_respondsToMethod(Class _Nullable cls, SEL _Nonnull sel)
+ __OSX_DEPRECATED(10.0, 10.5, "use class_respondsToSelector instead")
+ __IOS_DEPRECATED(2.0, 2.0, "use class_respondsToSelector instead")
+ __TVOS_DEPRECATED(9.0, 9.0, "use class_respondsToSelector instead")
+ __WATCHOS_DEPRECATED(1.0, 1.0, "use class_respondsToSelector instead")
+#ifndef __APPLE_BLEACH_SDK__
+ __BRIDGEOS_DEPRECATED(2.0, 2.0, "use class_respondsToSelector instead")
+#endif
+;
+
+OBJC_EXPORT void
+_objc_flush_caches(Class _Nullable cls)
+ __OSX_DEPRECATED(10.0, 10.5, "not recommended")
+ __IOS_DEPRECATED(2.0, 2.0, "not recommended")
+ __TVOS_DEPRECATED(9.0, 9.0, "not recommended")
+ __WATCHOS_DEPRECATED(1.0, 1.0, "not recommended")
+#ifndef __APPLE_BLEACH_SDK__
+ __BRIDGEOS_DEPRECATED(2.0, 2.0, "not recommended")
+#endif
+;
-OBJC_EXPORT id class_createInstanceFromZone(Class, size_t idxIvars, void *z) DEPRECATED_IN_MAC_OS_X_VERSION_10_5_AND_LATER;
+OBJC_EXPORT id _Nullable
+object_copyFromZone(id _Nullable anObject, size_t nBytes, void * _Nullable z)
+ OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.0, 10.5, "use object_copy instead");
-OBJC_EXPORT void class_addMethods(Class, struct objc_method_list *) OBJC2_UNAVAILABLE;
-OBJC_EXPORT void class_removeMethods(Class, struct objc_method_list *) OBJC2_UNAVAILABLE;
+OBJC_EXPORT id _Nullable
+object_realloc(id _Nullable anObject, size_t nBytes)
+ OBJC2_UNAVAILABLE;
-OBJC_EXPORT Class class_poseAs(Class imposter, Class original) OBJC2_UNAVAILABLE;
+OBJC_EXPORT id _Nullable
+object_reallocFromZone(id _Nullable anObject, size_t nBytes, void * _Nullable z)
+ OBJC2_UNAVAILABLE;
-OBJC_EXPORT unsigned int method_getSizeOfArguments(Method m) OBJC2_UNAVAILABLE;
-OBJC_EXPORT unsigned method_getArgumentInfo(struct objc_method *m, int arg, const char **type, int *offset) OBJC2_UNAVAILABLE;
+#define OBSOLETE_OBJC_GETCLASSES 1
+OBJC_EXPORT void * _Nonnull
+objc_getClasses(void)
+ OBJC2_UNAVAILABLE;
+
+OBJC_EXPORT void
+objc_addClass(Class _Nonnull myClass)
+ OBJC2_UNAVAILABLE;
+
+OBJC_EXPORT void
+objc_setClassHandler(int (* _Nullable )(const char * _Nonnull))
+ OBJC2_UNAVAILABLE;
+
+OBJC_EXPORT void
+objc_setMultithreaded(BOOL flag)
+ OBJC2_UNAVAILABLE;
+
+OBJC_EXPORT id _Nullable
+class_createInstanceFromZone(Class _Nullable, size_t idxIvars,
+ void * _Nullable z)
+ OBJC_OSX_DEPRECATED_OTHERS_UNAVAILABLE(10.0, 10.5, "use class_createInstance instead");
+
+OBJC_EXPORT void
+class_addMethods(Class _Nullable, struct objc_method_list * _Nonnull)
+ OBJC2_UNAVAILABLE;
+
+OBJC_EXPORT void
+class_removeMethods(Class _Nullable, struct objc_method_list * _Nonnull)
+ OBJC2_UNAVAILABLE;
+
+OBJC_EXPORT void
+_objc_resolve_categories_for_class(Class _Nonnull cls)
+ OBJC2_UNAVAILABLE;
+
+OBJC_EXPORT Class _Nonnull
+class_poseAs(Class _Nonnull imposter, Class _Nonnull original)
+ OBJC2_UNAVAILABLE;
+
+OBJC_EXPORT unsigned int
+method_getSizeOfArguments(Method _Nonnull m)
+ OBJC2_UNAVAILABLE;
+
+OBJC_EXPORT unsigned
+method_getArgumentInfo(struct objc_method * _Nonnull m, int arg,
+ const char * _Nullable * _Nonnull type,
+ int * _Nonnull offset)
+ UNAVAILABLE_ATTRIBUTE // This function was accidentally deleted in 10.9.
+ OBJC2_UNAVAILABLE;
+
+OBJC_EXPORT Class _Nullable
+objc_getOrigClass(const char * _Nonnull name)
+ OBJC2_UNAVAILABLE;
-OBJC_EXPORT BOOL class_respondsToMethod(Class, SEL) OBJC2_UNAVAILABLE;
-OBJC_EXPORT IMP class_lookupMethod(Class, SEL) OBJC2_UNAVAILABLE;
-OBJC_EXPORT Class objc_getOrigClass(const char *name) OBJC2_UNAVAILABLE;
#define OBJC_NEXT_METHOD_LIST 1
-OBJC_EXPORT struct objc_method_list *class_nextMethodList(Class, void **) OBJC2_UNAVAILABLE;
+OBJC_EXPORT struct objc_method_list * _Nullable
+class_nextMethodList(Class _Nullable, void * _Nullable * _Nullable)
+ OBJC2_UNAVAILABLE;
// usage for nextMethodList
//
// void *iterator = 0;
// struct objc_method_list *mlist;
// while ( mlist = class_nextMethodList( cls, &iterator ) )
// ;
-
-OBJC_EXPORT id (*_alloc)(Class, size_t) OBJC2_UNAVAILABLE;
-OBJC_EXPORT id (*_copy)(id, size_t) OBJC2_UNAVAILABLE;
-OBJC_EXPORT id (*_realloc)(id, size_t) OBJC2_UNAVAILABLE;
-OBJC_EXPORT id (*_dealloc)(id) OBJC2_UNAVAILABLE;
-OBJC_EXPORT id (*_zoneAlloc)(Class, size_t, void *) OBJC2_UNAVAILABLE;
-OBJC_EXPORT id (*_zoneRealloc)(id, size_t, void *) OBJC2_UNAVAILABLE;
-OBJC_EXPORT id (*_zoneCopy)(id, size_t, void *) OBJC2_UNAVAILABLE;
-OBJC_EXPORT void (*_error)(id, const char *, va_list) OBJC2_UNAVAILABLE;
+
+OBJC_EXPORT id _Nullable
+(* _Nonnull _alloc)(Class _Nullable, size_t)
+ OBJC2_UNAVAILABLE;
+
+OBJC_EXPORT id _Nullable
+(* _Nonnull _copy)(id _Nullable, size_t)
+ OBJC2_UNAVAILABLE;
+
+OBJC_EXPORT id _Nullable
+(* _Nonnull _realloc)(id _Nullable, size_t)
+ OBJC2_UNAVAILABLE;
+
+OBJC_EXPORT id _Nullable
+(* _Nonnull _dealloc)(id _Nullable)
+ OBJC2_UNAVAILABLE;
+
+OBJC_EXPORT id _Nullable
+(* _Nonnull _zoneAlloc)(Class _Nullable, size_t, void * _Nullable)
+ OBJC2_UNAVAILABLE;
+
+OBJC_EXPORT id _Nullable
+(* _Nonnull _zoneRealloc)(id _Nullable, size_t, void * _Nullable)
+ OBJC2_UNAVAILABLE;
+
+OBJC_EXPORT id _Nullable
+(* _Nonnull _zoneCopy)(id _Nullable, size_t, void * _Nullable)
+ OBJC2_UNAVAILABLE;
+
+OBJC_EXPORT void
+(* _Nonnull _error)(id _Nullable, const char * _Nonnull, va_list)
+ OBJC2_UNAVAILABLE;
#endif
projects / apple / objc4.git / blobdiff