/*
******************************************************************************
*
-* Copyright (C) 2002-2006, International Business Machines
+* Copyright (C) 2002-2012, International Business Machines
* Corporation and others. All Rights Reserved.
*
******************************************************************************
#include "unicode/utypes.h"
-U_NAMESPACE_BEGIN
-
/**
* \file
* \brief C++ API: Common ICU base class UObject.
*/
-/** U_OVERRIDE_CXX_ALLOCATION - Define this to override operator new and
- * delete in UMemory. Enabled by default for ICU.
+/**
+ * @{
+ * \def U_NO_THROW
+ * Define this to define the throw() specification so
+ * certain functions do not throw any exceptions
*
- * Enabling forces all allocation of ICU object types to use ICU's
- * memory allocation. On Windows, this allows the ICU DLL to be used by
- * applications that statically link the C Runtime library, meaning that
- * the app and ICU will be using different heaps.
+ * UMemory operator new methods should have the throw() specification
+ * appended to them, so that the compiler adds the additional NULL check
+ * before calling constructors. Without, if <code>operator new</code> returns NULL the
+ * constructor is still called, and if the constructor references member
+ * data, (which it typically does), the result is a segmentation violation.
*
- * @stable ICU 2.2
- */
-#ifndef U_OVERRIDE_CXX_ALLOCATION
-#define U_OVERRIDE_CXX_ALLOCATION 1
+ * @stable ICU 4.2
+ */
+#ifndef U_NO_THROW
+#define U_NO_THROW throw()
#endif
-/** U_HAVE_PLACEMENT_NEW - Define this to define the placement new and
- * delete in UMemory for STL.
- *
- * @stable ICU 2.6
- */
-#ifndef U_HAVE_PLACEMENT_NEW
-#define U_HAVE_PLACEMENT_NEW 1
-#endif
+/** @} */
+/*===========================================================================*/
+/* UClassID-based RTTI */
+/*===========================================================================*/
-#ifndef U_HIDE_DRAFT_API
-/** U_HAVE_DEBUG_LOCATION_NEW - Define this to define the MFC debug
- * version of the operator new.
+/**
+ * UClassID is used to identify classes without using the compiler's RTTI.
+ * This was used before C++ compilers consistently supported RTTI.
+ * ICU 4.6 requires compiler RTTI to be turned on.
*
- * @draft ICU 3.4
- */
-#ifndef U_HAVE_DEBUG_LOCATION_NEW
-#define U_HAVE_DEBUG_LOCATION_NEW 0
-#endif
-#endif /*U_HIDE_DRAFT_API*/
+ * Each class hierarchy which needs
+ * to implement polymorphic clone() or operator==() defines two methods,
+ * described in detail below. UClassID values can be compared using
+ * operator==(). Nothing else should be done with them.
+ *
+ * \par
+ * In class hierarchies that implement "poor man's RTTI",
+ * each concrete subclass implements getDynamicClassID() in the same way:
+ *
+ * \code
+ * class Derived {
+ * public:
+ * virtual UClassID getDynamicClassID() const
+ * { return Derived::getStaticClassID(); }
+ * }
+ * \endcode
+ *
+ * Each concrete class implements getStaticClassID() as well, which allows
+ * clients to test for a specific type.
+ *
+ * \code
+ * class Derived {
+ * public:
+ * static UClassID U_EXPORT2 getStaticClassID();
+ * private:
+ * static char fgClassID;
+ * }
+ *
+ * // In Derived.cpp:
+ * UClassID Derived::getStaticClassID()
+ * { return (UClassID)&Derived::fgClassID; }
+ * char Derived::fgClassID = 0; // Value is irrelevant
+ * \endcode
+ * @stable ICU 2.0
+ */
+typedef void* UClassID;
+
+U_NAMESPACE_BEGIN
/**
* UMemory is the common ICU base class.
class U_COMMON_API UMemory {
public:
+/* test versions for debugging shaper heap memory problems */
+#ifdef SHAPER_MEMORY_DEBUG
+ static void * NewArray(int size, int count);
+ static void * GrowArray(void * array, int newSize );
+ static void FreeArray(void * array );
+#endif
+
#if U_OVERRIDE_CXX_ALLOCATION
/**
* Override for ICU4C C++ memory management.
* for ICU4C C++ classes
* @stable ICU 2.4
*/
- static void * U_EXPORT2 operator new(size_t size);
+ static void * U_EXPORT2 operator new(size_t size) U_NO_THROW;
/**
* Override for ICU4C C++ memory management.
* See new().
* @stable ICU 2.4
*/
- static void * U_EXPORT2 operator new[](size_t size);
+ static void * U_EXPORT2 operator new[](size_t size) U_NO_THROW;
/**
* Override for ICU4C C++ memory management.
* for ICU4C C++ classes
* @stable ICU 2.4
*/
- static void U_EXPORT2 operator delete(void *p);
+ static void U_EXPORT2 operator delete(void *p) U_NO_THROW;
/**
* Override for ICU4C C++ memory management.
* See delete().
* @stable ICU 2.4
*/
- static void U_EXPORT2 operator delete[](void *p);
+ static void U_EXPORT2 operator delete[](void *p) U_NO_THROW;
#if U_HAVE_PLACEMENT_NEW
/**
* See new().
* @stable ICU 2.6
*/
- static inline void * U_EXPORT2 operator new(size_t, void *ptr) { return ptr; }
+ static inline void * U_EXPORT2 operator new(size_t, void *ptr) U_NO_THROW { return ptr; }
/**
* Override for ICU4C C++ memory management for STL.
* See delete().
* @stable ICU 2.6
*/
- static inline void U_EXPORT2 operator delete(void *, void *) {}
+ static inline void U_EXPORT2 operator delete(void *, void *) U_NO_THROW {}
#endif /* U_HAVE_PLACEMENT_NEW */
#if U_HAVE_DEBUG_LOCATION_NEW
/**
* @param file The file where the allocation was requested
* @param line The line where the allocation was requested
*/
- static void * U_EXPORT2 operator new(size_t size, const char* file, int line);
+ static void * U_EXPORT2 operator new(size_t size, const char* file, int line) U_NO_THROW;
/**
* This method provides a matching delete for the MFC debug new
*
* @param file The file where the allocation was requested
* @param line The line where the allocation was requested
*/
- static void U_EXPORT2 operator delete(void* p, const char* file, int line);
+ static void U_EXPORT2 operator delete(void* p, const char* file, int line) U_NO_THROW;
#endif /* U_HAVE_DEBUG_LOCATION_NEW */
#endif /* U_OVERRIDE_CXX_ALLOCATION */
* and all other public ICU C++ classes
* are derived from UObject (starting with ICU 2.2).
*
- * UObject contains common virtual functions like for ICU's "poor man's RTTI".
- * It does not contain default implementations of virtual methods
- * like getDynamicClassID to allow derived classes such as Format
- * to declare these as pure virtual.
+ * UObject contains common virtual functions, in particular a virtual destructor.
*
* The clone() function is not available in UObject because it is not
* implemented by all ICU classes.
/**
* ICU4C "poor man's RTTI", returns a UClassID for the actual ICU class.
+ * The base class implementation returns a dummy value.
+ *
+ * Use compiler RTTI rather than ICU's "poor man's RTTI".
+ * Since ICU 4.6, new ICU C++ class hierarchies do not implement "poor man's RTTI".
*
* @stable ICU 2.2
*/
- virtual UClassID getDynamicClassID() const = 0;
+ virtual UClassID getDynamicClassID() const;
protected:
// the following functions are protected to prevent instantiation and
// direct use of UObject itself
// default constructor
- // commented out because UObject is abstract (see getDynamicClassID)
// inline UObject() {}
// copy constructor
- // commented out because UObject is abstract (see getDynamicClassID)
// inline UObject(const UObject &other) {}
#if 0
* here would be to declare and empty-implement a protected or public one.
UObject &UObject::operator=(const UObject &);
*/
-
-// Future implementation for RTTI that support subtyping. [alan]
-//
-// public:
-// /**
-// * @internal
-// */
-// static UClassID getStaticClassID();
-//
-// /**
-// * @internal
-// */
-// UBool instanceOf(UClassID type) const;
};
+#ifndef U_HIDE_INTERNAL_API
/**
* This is a simple macro to add ICU RTTI to an ICU object implementation.
* This does not go into the header. This should only be used in *.cpp files.
return (UClassID)&classID; \
}
-// /**
-// * This macro adds ICU RTTI to an ICU concrete class implementation.
-// * This macro should be invoked in *.cpp files. The corresponding
-// * header should declare getDynamicClassID and getStaticClassID.
-// *
-// * @param myClass The name of the class that needs RTTI defined.
-// * @param myParent The name of the myClass's parent.
-// * @internal
-// */
-/*#define UOBJECT_DEFINE_RTTI_IMPLEMENTATION(myClass, myParent) \
- UOBJECT_DEFINE_ABSTRACT_RTTI_IMPLEMENTATION(myClass, myParent) \
- UClassID myClass::getDynamicClassID() const { \
- return myClass::getStaticClassID(); \
- }
-*/
-
+#endif /* U_HIDE_INTERNAL_API */
U_NAMESPACE_END
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