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[ogre] SharePtr

2008-08-16 15:38:08| 分类： 3d_ogre | 标签： |举报 |字号大中小订阅

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相关文件：
OgreSharedPtr.h

一个 shared ptr 的实现，利用 ref count 记录指针的引用情况。实现比较常见，没有特别之处。
只是 operator = 的实现上，有个小小技巧。

SharedPtr& operator=(const SharedPtr& r) {
   if (pRep == r.pRep)
       return *this;
   // Swap current data into a local copy
   // this ensures we deal with rhs and this being dependent
   SharedPtr<T> tmp(r);
   swap(tmp);
   return *this;
}

临时变量 tmp 创建，导致 r 的 ref count + 1，然后 swap() 将 this 与 tmp 中的所有内容交换，之后 tmp 会被析构，导致原来 this 所表示的指针的 ref count - 1。

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