cocos-enhance-kit/cocos2d-x/cocos/renderer/memop/RecyclePool.hpp

/****************************************************************************
 Copyright (c) 2018 Xiamen Yaji Software Co., Ltd.
 
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#ifndef RecyclePool_hpp
#define RecyclePool_hpp

#include <stdio.h>
#include "../Macro.h"
#include "../base/CCVector.h"

RENDERER_BEGIN
template<typename T>
class RecyclePool
{
public:
    typedef std::function<T*()> RecycleFunc;
    
    RecyclePool(RecycleFunc func, int size)
    : _data()
    {
        _count = 0;
        _func = func;
        _data.resize(size);
        
        for (int i = 0; i < size; i++)
        {
            _data[i] = func();
        }
    }
    
    ~RecyclePool()
    {
        for (size_t i = 0, len = _data.size(); i < len; i++)
        {
            delete _data[i];
        }
        
        _data.clear();
    }
    
    T* getData(size_t index) const
    {
        if (index >= _count)
        {
            RENDERER_LOGW("Failed to get data %zu, index not found.", index);
            return nullptr;
        }
        
        return _data[index];
    }
    
    const size_t getLength() const
    {
        return _count;
    }
    
    void reset()
    {
        _count = 0;
    }
    
    T* add()
    {
        int size = (int)_data.size();
        if (_count >= size)
        {
            resize(size * 2);
        }
        
        return _data[_count++];
    }
    
    void resize(int size)
    {
        if (size > _data.size())
        {
            for (int i = (int)_data.size(); i < size; i++)
            {
                T* data = _func();
                _data.push_back(data);
            }
        }
    }
    
    void remove(int index)
    {
        if (index >= _count)
        {
            return;
        }
        
        int last = _count - 1;
        T tmp = _data[index];
        _data[index] = _data[last];
        _data[last] = tmp;
        _count -= 1;
    }
private:
    size_t _count = 0;
    RecycleFunc _func;
    std::vector<T*> _data;

    
};
RENDERER_END

#endif /* RecyclePool_hpp */