class parent{public:    ~parent() { std::cout <<"destroying parent\n"; }public:    children_ptr children;};class children{public:    ~children() { std::cout <<"destroying children\n"; }public:    parent_ptr parent;};void test(){    parent_ptr father(new parent());    children_ptr son(new children);    father->children = son;    son->parent = father;}

 

在函数 test() 中，father->children = son, 使得 father 的计数器加至 2， son 同理，以至于析构 father(或son)时，仅仅是计数器减一，指针指向的资源并没有被析构。

 

 

参考

[1] http://blog.csdn.net/liuzhi1218/article/details/6993135