Dario Sassi
68 lines
2.4 KiB
C++
68 lines
2.4 KiB
C++
//////////////////////////////////////////////////////////////////////////////////////////
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/**
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\file
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\brief \ru Надкласс для объектов, время жизни которых автоматически регулируется счетчиком ссылок.
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\en Superclass for objects their lifetime is automatically regulated by reference counter.
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*/
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//////////////////////////////////////////////////////////////////////////////////////////
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#ifndef __MT_REF_ITEM_H
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#define __MT_REF_ITEM_H
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#include <math_define.h>
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#if defined (C3D_WINDOWS ) && !defined(ALL_WARNINGS) //_MSC_VER // Set warnings level
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#pragma warning(disable: 4275) //AP non dll-interface class '1' used as base for dll-interface class '2' (deriving exported from non-exported)
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#endif
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//////////////////////////////////////////////////////////////////////////////////////////
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/**
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\brief \ru Базовый класс для объектов с подсчетом ссылок.
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\en Base class for objects with reference counting. \~
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\ingroup Base_Items
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\sa #MbRefItem, #SPtr
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*/
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//////////////////////////////////////////////////////////////////////////////////////////
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class MtRefItem
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{
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mutable refcount_t useCount;
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protected:
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MtRefItem() : useCount(0) {}
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virtual ~MtRefItem() {}
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public:
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/// \ru Добавить одну ссылку на объект. \en Adds a reference to this object.
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refcount_t AddRef() const { return ++useCount; }
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/// \ru Освободить одну ссылку на объект. \en Releases a reference to this object.
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refcount_t Release() const;
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public:
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/// \ru Вернуть количество объектов, ссылающихся на данный. \en Returns a number of objects referring to this.
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refcount_t GetUseCount() const { return useCount; }
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private:
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MtRefItem( const MtRefItem & );
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MtRefItem & operator = ( const MtRefItem & );
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};
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//----------------------------------------------------------------------------------------
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//
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//---
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inline refcount_t MtRefItem::Release() const
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{
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if ( !useCount || (--useCount == 0) )
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{
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delete this; // \ru Вызов виртуального деструктора \en Call of virtual destructor
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return 0;
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}
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return useCount;
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}
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#endif // __MT_REF_ITEM_H
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// eof
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