cocos2dx 采用引用计数管理自己的内存：
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class
CC_DLL Object{public: /// object id, ScriptSupport need public _ID unsigned
int _ID; /// Lua reference id int
_luaID;protected: /// count of references unsigned
int _reference; /// count of autorelease unsigned
int _autoReleaseCount;public: /** * Constructor * * The object‘s reference count is 1 after construction. * @js NA */ Object(); /** * @js NA * @lua NA */ virtual ~Object(); /** * Release the ownership immediately. * * This decrements the object‘s reference count. * * If the reference count reaches 0 after the descrement, this object is * destructed. * * @see retain, autorelease * @js NA */ inline
void release() { CCASSERT(_reference >
0, "reference count should greater than 0"); --_reference; if
(_reference == 0) delete
this; } /** * Retains the ownership. * * This increases the object‘s reference count. * * @see release, autorelease * @js NA */ inline
void retain() { CCASSERT(_reference >
0, "reference count should greater than 0"); ++_reference; } /** * Release the ownership sometime soon automatically. * * This descrements the object‘s reference count at the end of current * autorelease pool block. * * If the reference count reaches 0 after the descrement, this object is * destructed. * * @returns The object itself. * * @see AutoreleasePool, retain, release * @js NA * @lua NA */ Object* autorelease(); /** * Returns a boolean value that indicates whether there is only one * reference to the object. That is, whether the reference count is 1. * * @returns Whether the object‘s reference count is 1. * @js NA */ bool isSingleReference()
const; /** * Returns the object‘s current reference count. * * @returns The object‘s reference count. * @js NA */ unsigned
int retainCount()
const; /** * Returns a boolean value that indicates whether this object and a given * object are equal. * * @param object The object to be compared to this object. * * @returns True if this object and @p object are equal, otherwise false. * @js NA * @lua NA */ virtual bool isEqual(const
Object* object); /** * @js NA * @lua NA */ virtual
void acceptVisitor(DataVisitor &visitor); /** * @js NA * @lua NA */ virtual
void update(float
dt) {CC_UNUSED_PARAM(dt);}; friend
class AutoreleasePool;}; |
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auto sprite1 =
new Sprite();sprite1->initWithSpriteFrameName("btn_adventure_normal_CN.png");//引用计数器+1CCLOG("retaincount = %d",sprite1->retainCount());sprite1->retain();//引用计数器+1CCLOG("retaincount = %d",sprite1->retainCount());sprite1->release();//引用计数器-1CCLOG("retaincount = %d",sprite1->retainCount());sprite1->autorelease();//只是把该sprite放入自动释放池中。引用计数器不变。等待管理器自动释放CCLOG("retaincount = %d",sprite1->retainCount()); |
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#define CC_SYNTHESIZE_RETAIN(varType, varName, funName) \private: varType varName; \public: virtual varType get##funName(void)
const {
return varName; } \public: virtual
void set##funName(varType var) \{ \ if
(varName != var) \ { \ CC_SAFE_RETAIN(var); \ CC_SAFE_RELEASE(varName); \ varName = var; \ } \} #define CC_SAFE_DELETE(p)
do { delete (p); (p) = nullptr; }
while(0)#define CC_SAFE_DELETE_ARRAY(p)
do { if(p) { delete[] (p); (p) = nullptr; } }
while(0)#define CC_SAFE_FREE(p)
do { if(p) { free(p); (p) = nullptr; } }
while(0)#define CC_SAFE_RELEASE(p)
do { if(p) { (p)->release(); } }
while(0)#define CC_SAFE_RELEASE_NULL(p)
do { if(p) { (p)->release(); (p) = nullptr; } }
while(0)#define CC_SAFE_RETAIN(p)
do { if(p) { (p)->retain(); } }
while(0) |
原文地址：http://blog.csdn.net/zhanghefu/article/details/38616407
