@class wxObjectRefData
@wxheader{object.h}
- This class is used to store reference-counted data. Derive classes from this to
- store your own data. When retrieving information from a @b wxObject's reference
- data,
- you will need to cast to your own derived class.
+ This class is used to store reference-counted data.
+
+ Derive classes from this to store your own data. When retrieving information
+ from a wxObject's reference data, you will need to cast to your own derived class.
+
+ @b Example:
+
+ @code
+ // include file
+
+ class MyCar: public wxObject
+ {
+ public:
+ MyCar() { }
+ MyCar( int price );
+
+ bool IsOk() const { return m_refData != NULL; }
+
+ bool operator == ( const MyCar& car ) const;
+ bool operator != (const MyCar& car) const { return !(*this == car); }
+
+ void SetPrice( int price );
+ int GetPrice() const;
+
+ protected:
+ virtual wxObjectRefData *CreateRefData() const;
+ virtual wxObjectRefData *CloneRefData(const wxObjectRefData *data) const;
+
+ DECLARE_DYNAMIC_CLASS(MyCar)
+ };
+
+
+ // implementation
+
+ class MyCarRefData: public wxObjectRefData
+ {
+ public:
+ MyCarRefData()
+ {
+ m_price = 0;
+ }
+
+ MyCarRefData( const MyCarRefData& data )
+ : wxObjectRefData()
+ {
+ m_price = data.m_price;
+ }
+
+ bool operator == (const MyCarRefData& data) const
+ {
+ return m_price == data.m_price;
+ }
+
+ int m_price;
+ };
+
+
+ #define M_CARDATA ((MyCarRefData *)m_refData)
+
+ IMPLEMENT_DYNAMIC_CLASS(MyCar,wxObject)
+
+ MyCar::MyCar( int price )
+ {
+ m_refData = new MyCarRefData();
+ M_CARDATA->m_price = price;
+ }
+
+ wxObjectRefData *MyCar::CreateRefData() const
+ {
+ return new MyCarRefData;
+ }
+
+ wxObjectRefData *MyCar::CloneRefData(const wxObjectRefData *data) const
+ {
+ return new MyCarRefData(*(MyCarRefData *)data);
+ }
+
+ bool MyCar::operator == ( const MyCar& car ) const
+ {
+ if (m_refData == car.m_refData) return true;
+
+ if (!m_refData || !car.m_refData) return false;
+
+ return ( *(MyCarRefData*)m_refData == *(MyCarRefData*)car.m_refData );
+ }
+
+ void MyCar::SetPrice( int price )
+ {
+ UnShare();
+
+ M_CARDATA->m_price = price;
+ }
+
+ int MyCar::GetPrice() const
+ {
+ wxCHECK_MSG( IsOk(), -1, "invalid car" );
+
+ return (M_CARDATA->m_price);
+ }
+ @endcode
+
@library{wxbase}
- @category{FIXME}
+ @category{rtti}
- @see wxObject, wxObjectDataPtrT(), @ref overview_trefcount "Reference counting"
+ @see wxObject, wxObjectDataPtr<T>, @ref overview_refcount
*/
class wxObjectRefData
{
+protected:
+ /**
+ Destructor.
+
+ It's declared @c protected so that wxObjectRefData instances
+ will never be destroyed directly but only as result of a DecRef() call.
+ */
+ ~wxObjectRefData();
+
public:
/**
Default constructor. Initialises the internal reference count to 1.
wxObjectRefData();
/**
- Destructor. It's declared @c protected so that wxObjectRefData instances will
- never
- be destroyed directly but only as result of a DecRef() call.
- */
- ~wxObjectRefData();
+ Decrements the reference count associated with this shared data and, if
+ it reaches zero, destroys this instance of wxObjectRefData releasing its
+ memory.
- /**
- Decrements the reference count associated with this shared data and, if it
- reaches zero,
- destroys this instance of wxObjectRefData releasing its memory.
- Please note that after calling this function, the caller should absolutely
- avoid to use
- the pointer to this instance since it may not be valid anymore.
+ Please note that after calling this function, the caller should
+ absolutely avoid to use the pointer to this instance since it may not be
+ valid anymore.
*/
void DecRef();
/**
Returns the reference count associated with this shared data.
- When this goes to zero during a DecRef() call, the object
- will auto-free itself.
+
+ When this goes to zero during a DecRef() call, the object will auto-free itself.
*/
int GetRefCount() const;
@wxheader{object.h}
This is the root class of many of the wxWidgets classes.
- It declares a virtual destructor which ensures that
- destructors get called for all derived class objects where necessary.
- wxObject is the hub of a dynamic object creation
- scheme, enabling a program to create instances of a class only knowing
- its string class name, and to query the class hierarchy.
+ It declares a virtual destructor which ensures that destructors get called
+ for all derived class objects where necessary.
- The class contains optional debugging versions
- of @b new and @b delete, which can help trace memory allocation
- and deallocation problems.
+ wxObject is the hub of a dynamic object creation scheme, enabling a program
+ to create instances of a class only knowing its string class name, and to
+ query the class hierarchy.
- wxObject can be used to implement @ref overview_trefcount "reference counted"
- objects,
- such as wxPen, wxBitmap and others (see @ref overview_refcountlist "this list").
+ The class contains optional debugging versions of @b new and @b delete, which
+ can help trace memory allocation and deallocation problems.
+
+ wxObject can be used to implement @ref overview_refcount "reference counted"
+ objects, such as wxPen, wxBitmap and others
+ (see @ref overview_refcount_list "this list").
@library{wxbase}
@category{rtti}
- @see wxClassInfo, @ref overview_debuggingoverview, wxObjectRefData
+ @see wxClassInfo, @ref overview_debugging, wxObjectRefData
*/
class wxObject
{
public:
- //@{
+
+ wxObject();
+
/**
- Default and copy constructors.
+ Copy ctor.
*/
- wxObject();
wxObject(const wxObject& other);
- //@}
+
/**
- Destructor. Performs dereferencing, for those objects
- that use reference counting.
+ Destructor.
+
+ Performs dereferencing, for those objects that use reference counting.
*/
wxObject();
/**
A virtual function that may be redefined by derived classes to allow dumping of
memory states.
- This function is only defined in debug build and doesn't exist at all if
- @c __WXDEBUG__ is not defined.
+
+ This function is only defined in debug build and exists only if @c __WXDEBUG__
+ is defined.
@param stream
Stream on which to output dump information.
- @remarks Currently wxWidgets does not define Dump for derived classes,
- but programmers may wish to use it for their own
- applications. Be sure to call the Dump member of the
- class's base class to allow all information to be
- dumped.
+ @remarks Currently wxWidgets does not define Dump() for derived classes,
+ but programmers may wish to use it for their own applications.
+ Be sure to call the Dump member of the class's base class to allow all
+ information to be dumped.
+ The implementation of this function in wxObject just writes
+ the class name of the object.
*/
void Dump(ostream& stream);
/**
This virtual function is redefined for every class that requires run-time
- type information, when using DECLARE_CLASS macros.
+ type information, when using the ::DECLARE_CLASS macro (or similar).
*/
wxClassInfo* GetClassInfo();
/**
- Returns the @b m_refData pointer.
+ Returns the wxObject::m_refData pointer, i.e. the data referenced by this object.
- @see Ref(), UnRef(), wxObject::m_refData, SetRefData(),
- wxObjectRefData
+ @see Ref(), UnRef(), wxObject::m_refData, SetRefData(), wxObjectRefData
*/
wxObjectRefData* GetRefData() const;
Determines whether this class is a subclass of (or the same class as)
the given class.
+ Example:
+
+ @code
+ bool tmp = obj->IsKindOf(CLASSINFO(wxFrame));
+ @endcode
+
@param info
A pointer to a class information object, which may be obtained
- by using the CLASSINFO macro.
+ by using the ::CLASSINFO macro.
@returns @true if the class represented by info is the same class as this
one or is derived from it.
bool IsKindOf(wxClassInfo* info);
/**
- Returns @true if this object has the same data pointer as @e obj. Notice
- that @true is returned if the data pointers are @NULL in both objects.
- This function only does a shallow comparison, i.e. it doesn't compare
+ Returns @true if this object has the same data pointer as @a obj.
+
+ Notice that @true is returned if the data pointers are @NULL in both objects.
+
+ This function only does a @e shallow comparison, i.e. it doesn't compare
the objects pointed to by the data pointers of these objects.
+
+ @see @ref overview_refcount
*/
bool IsSameAs(const wxObject& obj);
/**
- Makes this object refer to the data in @e clone.
+ Makes this object refer to the data in @a clone.
@param clone
The object to 'clone'.
@remarks First this function calls UnRef() on itself to decrement
- (and perhaps free) the data it is currently referring
- to.
+ (and perhaps free) the data it is currently referring to.
+ It then sets its own wxObject::m_refData to point to that of @a clone,
+ and increments the reference count inside the data.
- @see UnRef(), wxObject::m_refData, SetRefData(),
- GetRefData(), wxObjectRefData
+ @see UnRef(), SetRefData(), GetRefData(), wxObjectRefData
*/
void Ref(const wxObject& clone);
/**
- Sets the @b m_refData pointer.
+ Sets the wxObject::m_refData pointer.
- @see Ref(), UnRef(), wxObject::m_refData, GetRefData(),
- wxObjectRefData
+ @see Ref(), UnRef(), GetRefData(), wxObjectRefData
*/
void SetRefData(wxObjectRefData* data);
/**
Decrements the reference count in the associated data, and if it is zero,
deletes the data.
- The @b m_refData member is set to @NULL.
- @see Ref(), wxObject::m_refData, SetRefData(),
- GetRefData(), wxObjectRefData
+ The wxObject::m_refData member is set to @NULL.
+
+ @see Ref(), SetRefData(), GetRefData(), wxObjectRefData
*/
void UnRef();
/**
Ensure that this object's data is not shared with any other object.
- if we have no
- data, it is created using CreateRefData() below, if we have shared data
- it is copied using CloneRefData(), otherwise nothing is done.
+
+ If we have no data, it is created using CreateRefData() below,
+ if we have shared data, it is copied using CloneRefData(),
+ otherwise nothing is done.
*/
void UnShare();
/**
- wxObjectRefData* m_refData
- Pointer to an object which is the object's reference-counted data.
+ The @e delete operator is defined for debugging versions of the library only,
+ when the identifier @c __WXDEBUG__ is defined.
- @see Ref(), UnRef(), SetRefData(),
- GetRefData(), wxObjectRefData
+ It takes over memory deallocation, allowing wxDebugContext operations.
*/
-
+ void operator delete(void *buf);
/**
- The @e delete operator is defined for debugging versions of the library only,
- when
- the identifier __WXDEBUG__ is defined. It takes over memory deallocation,
- allowing
- wxDebugContext operations.
+ The @e new operator is defined for debugging versions of the library only, when
+ the identifier @c __WXDEBUG__ is defined.
+
+ It takes over memory allocation, allowing wxDebugContext operations.
*/
- void delete(void buf);
+ void* operator new(size_t size, const wxString& filename = NULL, int lineNum = 0);
+
+protected:
/**
- The @e new operator is defined for debugging versions of the library only, when
- the identifier __WXDEBUG__ is defined. It takes over memory allocation, allowing
- wxDebugContext operations.
+ Pointer to an object which is the object's reference-counted data.
+
+ @see Ref(), UnRef(), SetRefData(), GetRefData(), wxObjectRefData
*/
- void* new(size_t size, const wxString& filename = NULL,
- int lineNum = 0);
+ wxObjectRefData* m_refData;
};
@class wxClassInfo
@wxheader{object.h}
- This class stores meta-information about classes. Instances of this class are
- not generally defined directly by an application, but indirectly through use
- of macros such as @b DECLARE_DYNAMIC_CLASS and @b IMPLEMENT_DYNAMIC_CLASS.
+ This class stores meta-information about classes.
+
+ Instances of this class are not generally defined directly by an application,
+ but indirectly through use of macros such as ::DECLARE_DYNAMIC_CLASS and
+ ::IMPLEMENT_DYNAMIC_CLASS.
@library{wxbase}
@category{rtti}
- @see Overview(), wxObject
+ @see @ref overview_rtti_classinfo, wxObject
*/
class wxClassInfo
{
public:
/**
- Constructs a wxClassInfo object. The supplied macros implicitly construct
- objects of this
- class, so there is no need to create such objects explicitly in an application.
+ Constructs a wxClassInfo object.
+
+ The supplied macros implicitly construct objects of this class, so there is no
+ need to create such objects explicitly in an application.
*/
wxClassInfo(const wxChar* className,
const wxClassInfo* baseClass1,
int size, wxObjectConstructorFn fn);
/**
- Creates an object of the appropriate kind. Returns @NULL if the class has not
- been declared
- dynamically creatable (typically, it is an abstract class).
+ Creates an object of the appropriate kind.
+
+ @returns @NULL if the class has not been declared dynamically creatable
+ (typically, this happens for abstract classes).
*/
wxObject* CreateObject() const;
/**
- Finds the wxClassInfo object for a class of the given string name.
+ Finds the wxClassInfo object for a class with the given @a name.
*/
static wxClassInfo* FindClass(wxChar* name);
int GetSize() const;
/**
- Initializes pointers in the wxClassInfo objects for fast execution
- of IsKindOf. Called in base wxWidgets library initialization.
+ Initializes pointers in the wxClassInfo objects for fast execution of IsKindOf().
+ Called in base wxWidgets library initialization.
*/
static void InitializeClasses();
/**
@wxheader{object.h}
- This is helper template class primarily written to avoid memory
- leaks because of missing calls to wxObjectRefData::DecRef.
+ This is helper template class primarily written to avoid memory leaks because of
+ missing calls to wxObjectRefData::DecRef().
- Despite the name this template can actually be used as a
- smart pointer for any class implementing the reference
- counting interface which only consists of the two methods
- @b T::IncRef() and @b T::DecRef().
+ Despite the name this template can actually be used as a smart pointer for any
+ class implementing the reference counting interface which only consists of the two
+ methods @b T::IncRef() and @b T::DecRef().
- The difference to wxSharedPtr is that
- wxObjectDataPtr relies on the reference counting to be in
- the class pointed to where as wxSharedPtr implements the
+ The difference to wxSharedPtr<T> is that wxObjectDataPtr<T> relies on the reference
+ counting to be in the class pointed to where instead wxSharedPtr<T> implements the
reference counting itself.
+
+ @b Example:
+
+ @code
+ class MyCarRefData: public wxObjectRefData
+ {
+ public:
+ MyCarRefData() { m_price = 0; }
+
+ MyCarRefData( const MyCarRefData& data )
+ : wxObjectRefData()
+ {
+ m_price = data.m_price;
+ }
+
+ void SetPrice( int price ) { m_price = price; }
+ int GetPrice() { return m_price; }
+
+ protected:
+ int m_price;
+ };
+
+ class MyCar
+ {
+ public:
+ MyCar( int price ) : m_data( new MyCarRefData )
+ {
+ m_data->SetPrice( price );
+ }
+
+ MyCar& operator =( const MyCar& tocopy )
+ {
+ m_data = tocopy.m_data;
+ return *this;
+ }
+
+ bool operator == ( const MyCar& other ) const
+ {
+ if (m_data.get() == other.m_data.get()) return true;
+ return (m_data->GetPrice() == other.m_data->GetPrice());
+ }
+
+ void SetPrice( int price )
+ {
+ UnShare();
+ m_data->SetPrice( price );
+ }
+
+ int GetPrice() const
+ {
+ return m_data->GetPrice();
+ }
+
+ wxObjectDataPtr<MyCarRefData> m_data;
+
+ protected:
+ void UnShare()
+ {
+ if (m_data->GetRefCount() == 1)
+ return;
+
+ m_data.reset( new MyCarRefData( *m_data ) );
+ }
+ };
+ @endcode
+
+
@library{wxbase}
- @category{FIXME}
+ @category{rtti,smartpointers}
- @see wxObject, wxObjectRefData, @ref overview_trefcount "Reference counting"
+ @see wxObject, wxObjectRefData, @ref overview_refcount, wxSharedPtr<T>,
+ wxScopedPtr<T>, wxWeakRef<T>
*/
class wxObjectDataPtr<T>
{
public:
- //@{
/**
- This copy constructor increases the count of the reference
- counted object to which @a tocopy points and then this
- class will point to, as well.
+ Constructor.
+
+ @a ptr is a pointer to the reference counted object to which this class points.
+ If @a ptr is not NULL @b T::IncRef() will be called on the object.
*/
- wxObjectDataPtrT(T* ptr = NULL);
- wxObjectDataPtrT(const wxObjectDataPtr<T>& tocopy);
- //@}
+ wxObjectDataPtr<T>(T* ptr = NULL);
/**
- Decreases the reference count of the object to which this
- class points.
+ This copy constructor increases the count of the reference counted object to
+ which @a tocopy points and then this class will point to, as well.
*/
- ~wxObjectDataPtrT();
+ wxObjectDataPtr<T>(const wxObjectDataPtr<T>& tocopy);
+
/**
- Gets a pointer to the reference counted object to which
- this class points.
+ Decreases the reference count of the object to which this class points.
+ */
+ ~wxObjectDataPtr<T>();
+
+ /**
+ Gets a pointer to the reference counted object to which this class points.
*/
T* get() const;
+ /**
+ Reset this class to ptr which points to a reference counted object and
+ calls T::DecRef() on the previously owned object.
+ */
+ void reset(T *ptr)
+
/**
Conversion to a boolean expression (in a variant which is not
- convertable to anything but a boolean expression). If this class
- contains a valid pointer it will return @e @true, if it contains
- a @NULL pointer it will return @e @false.
+ convertable to anything but a boolean expression).
+
+ If this class contains a valid pointer it will return @true, if it contains
+ a @NULL pointer it will return @false.
*/
operator unspecified_bool_type() const;
/**
- Returns a reference to the object. If the internal pointer is @NULL
- this method will cause an assert in debug mode.
+ Returns a reference to the object.
+
+ If the internal pointer is @NULL this method will cause an assert in debug mode.
*/
- T operator*() const;
+ T& operator*() const;
/**
- Returns a pointer to the reference counted object to which
- this class points. If this the internal pointer is @NULL,
- this method will assert in debug mode.
+ Returns a pointer to the reference counted object to which this class points.
+
+ If this the internal pointer is @NULL, this method will assert in debug mode.
*/
- T* operator-() const;
+ T* operator->() const;
//@{
/**
- Assignment operators.
+ Assignment operator.
*/
- wxObjectDataPtrT& operator operator=(const wxObjectDataPtr<T>& tocopy);
- wxObjectDataPtrT& operator operator=(T* ptr);
+ wxObjectDataPtr<T>& operator=(const wxObjectDataPtr<T>& tocopy);
+ wxObjectDataPtr<T>& operator=(T* ptr);
//@}
};
#define IMPLEMENT_DYNAMIC_CLASS2( className, baseClassName1, baseClassName2 )
/**
- Same as const_cast<T>(x) if the compiler supports const cast or (T)x for
- old compilers. Unlike wxConstCast(), the cast it to the type T and not to
- T * and also the order of arguments is the same as for the standard cast.
+ Same as @c const_cast<T>(x) if the compiler supports const cast or @c (T)x for
+ old compilers. Unlike wxConstCast(), the cast it to the type @c T and not to
+ <tt>T *</tt> and also the order of arguments is the same as for the standard cast.
@header{wx/defs.h}
#define wx_const_cast(T, x)
/**
- Same as reinterpret_cast<T>(x) if the compiler supports reinterpret cast or
- (T)x for old compilers.
+ Same as @c reinterpret_cast<T>(x) if the compiler supports reinterpret cast or
+ @c (T)x for old compilers.
@header{wx/defs.h}
#define wx_reinterpret_cast(T, x)
/**
- Same as static_cast<T>(x) if the compiler supports static cast or (T)x for
+ Same as @c static_cast<T>(x) if the compiler supports static cast or @c (T)x for
old compilers. Unlike wxStaticCast(), there are no checks being done and
the meaning of the macro arguments is exactly the same as for the standard
- static cast, i.e. T is the full type name and star is not appended to it.
+ static cast, i.e. @a T is the full type name and star is not appended to it.
@header{wx/defs.h}
#define wx_truncate_cast(T, x)
/**
- This macro expands into const_cast<classname *>(ptr) if the compiler
+ This macro expands into <tt>const_cast<classname *>(ptr)</tt> if the compiler
supports const_cast or into an old, C-style cast, otherwise.
@header{wx/defs.h}
*/
#define wxConstCast( ptr, classname )
-/**
- This is defined in debug mode to be call the redefined new operator
- with filename and line number arguments. The definition is:
-
- @code
- #define WXDEBUG_NEW new(__FILE__,__LINE__)
- @endcode
-
- In non-debug mode, this is defined as the normal new operator.
-
- @header{wx/object.h}
-*/
-#define WXDEBUG_NEW( arg )
-
/**
This macro returns the pointer @e ptr cast to the type @e classname * if
the pointer is of this type (the check is done during the run-time) or
}
@endcode
- @see @ref overview_runtimeclassoverview "RTTI Overview",
- wxDynamicCastThis(), wxConstCast(), wxStaticCast()
+ @see @ref overview_rtti, wxDynamicCastThis(), wxConstCast(), wxStaticCast()
*/
#define wxDynamicCast( ptr, classname )
/**
- This macro is equivalent to wxDynamicCast() but the latter provokes
+ This macro is equivalent to <tt>wxDynamicCast(this, classname)</tt> but the latter provokes
spurious compilation warnings from some compilers (because it tests whether
@c this pointer is non-@NULL which is always true), so this macro should be
used to avoid them.
/**
This macro checks that the cast is valid in debug mode (an assert failure
will result if wxDynamicCast(ptr, classname) == @NULL) and then returns the
- result of executing an equivalent of static_cast<classname *>(ptr).
+ result of executing an equivalent of <tt>static_cast<classname *>(ptr)</tt>.
@header{wx/object.h}
//@}
+/** @ingroup group_funcmacro_debug */
+//@{
+
+/**
+ This is defined in debug mode to be call the redefined new operator
+ with filename and line number arguments. The definition is:
+
+ @code
+ #define WXDEBUG_NEW new(__FILE__,__LINE__)
+ @endcode
+
+ In non-debug mode, this is defined as the normal new operator.
+
+ @header{wx/object.h}
+*/
+#define WXDEBUG_NEW( arg )
+
+//@}
+
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