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.youkuaiyun.com/liuzhi1218/article/details/6993135