cocos2dx的内存管理机制

以下是自己看代码的：

main函数中有这样一句：return Application::getInstance()->run();直接跳到这部分代码看下，while循环下有一句：director->mainLoop();

voID displaylinkDirector::mainLoop(){    if (_purgeDirectorInNextLoop)    {        _purgeDirectorInNextLoop = false;        purgeDirector();    }    else if (! _invalID)    {        drawScene();             // release the objects        PoolManager::getInstance()->getCurrentPool()->clear();    }}

voID autoreleasePool::clear(){#if defined(COCOS2D_DEBUG) && (COCOS2D_DEBUG > 0)    _isClearing = true;#endif    for (const auto &obj : _managedobjectArray)    {        obj->release();    }    _managedobjectArray.clear();#if defined(COCOS2D_DEBUG) && (COCOS2D_DEBUG > 0)    _isClearing = false;#endif}

voID Ref::release(){    CCASSERT(_referenceCount > 0,"reference count should greater than 0");    --_referenceCount;        if (_referenceCount == 0)    {#if defined(COCOS2D_DEBUG) && (COCOS2D_DEBUG > 0)        auto poolManager = PoolManager::getInstance();        if (!poolManager->getCurrentPool()->isClearing() && poolManager->isObjectInPools(this))        {            // Trigger an assert if the reference count is 0 but the Ref is still in autorelease pool.            // This happens when 'autorelease/release' were not used in pairs with 'new/retain'.            //            // Wrong usage (1):            //            // auto obj = Node::create();   // Ref = 1,but it's an autorelease Ref which means it was in the autorelease pool.            // obj->autorelease();   // Wrong: If you wish to invoke autorelease several times,you should retain `obj` first.            //            // Wrong usage (2):            //            // auto obj = Node::create();            // obj->release();   // Wrong: obj is an autorelease Ref,it will be released when clearing current pool.            //            // Correct usage (1):            //            // auto obj = Node::create();            //                     |-   new Node();     // `new` is the pair of the `autorelease` of next line            //                     |-   autorelease();  // The pair of `new Node`.            //            // obj->retain();            // obj->autorelease();  // This `autorelease` is the pair of `retain` of prevIoUs line.            //            // Correct usage (2):            //            // auto obj = Node::create();            // obj->retain();            // obj->release();   // This `release` is the pair of `retain` of prevIoUs line.            CCASSERT(false,"The reference shouldn't be 0 because it is still in autorelease pool.");        }#endif        delete this;    }}

Sprite* Sprite::create(const std::string& filename){    Sprite *sprite = new Sprite(); //引用计数为1    if (sprite && sprite->initWithfile(filename))    {        sprite->autorelease();//并且交给回收池管理        return sprite;    }    CC_SAFE_DELETE(sprite);    return nullptr;}

voID Node::insertChild(Node* child,int z)
{
_reorderChildDirty = true;
_children.pushBack(child);
child->_setLocalZOrder(z);
}

再看pushBack,

voID pushBack(T object)    {        CCASSERT(object != nullptr,"The object should not be nullptr");        _data.push_back( object );        object->retain();    }

voID Node::removeFromParentAndCleanup(bool cleanup){    if (_parent != nullptr)    {        _parent->removeChild(this,cleanup);    } }

voID Node::removeChild(Node* child,bool cleanup /* = true */){    // explicit nil handling    if (_children.empty())    {        return;    }    ssize_t index = _children.getIndex(child);    if( index != CC_INVALID_INDEX )        this->detachChild( child,index,cleanup );}

voID Node::detachChild(Node *child,ssize_t childindex,bool doCleanup){    // important:    //  -1st do onExit    //  -2nd cleanup    if (_running)    {        child->onExitTransitionDIDStart();        child->onExit();    }    #if CC_USE_PHYSICS    if (child->_physicsBody != nullptr)    {        child->_physicsBody->removeFromWorld();    }    #endif    // If you don't do cleanup,the child's actions will not get removed and the    // its scheduledSelectors_ dict will not get released!    if (doCleanup)    {        child->cleanup();    }    // set parent nil at the end    child->setParent(nullptr);    _children.erase(childindex);}

 iterator erase(ssize_t index)    {        CCASSERT(!_data.empty() && index >=0 && index < size(),"InvalID index!");        auto it = std::next( begin(),index );        (*it)->release();        return _data.erase(it);    }

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