STL 是否允许对容器的元素多次调用析构函数

Question

基本上我有一个奇怪的问题，我有一个继承自计数器结构的节点结构。在计数器结构中，我进行了此检查以“确保”仅在分配的内存上调用析构函数并且仅调用一次。

static atomic < int > check;

counter()
      {
          check=42;
//...
      }

 ~counter() 
    {
        if (check!=42)
        {
            cout<<"ouch"<< typeid(T).name()<<"  "<< check<<"  "<< objects_created<< endl;
            sleep(1);
            assert(0);
        }
        check=84;
     //...
    }

当用 g++4.6 编译时它会崩溃

3  0x00007ffff65ec7a4 in counter<Node>::~counter (this=0x614c60, 
    __in_chrg=<value optimized out>)
    at /home...


4  0x00007ffff65e7a4d in Node::~Node (this=0x614c60, 
    __in_chrg=<value optimized out>)
    at /home...


5  0x00007ffff6603cf2 in std::_Destroy<Node> (__pointer=0x614c60)
    at /usr/include/c++/4.6/bits/stl_construct.h:92


6  0x00007ffff6600004 in std::_Destroy_aux<false>::__destroy<Node*> (
    __first=0x614c60, __last=0x614d40)
    at /usr/include/c++/4.6/bits/stl_construct.h:102


7  0x00007ffff65fa003 in std::_Destroy<Node*> (__first=0x614c60, 
    __last=0x614d40) at /usr/include/c++/4.6/bits/stl_construct.h:125


8  0x00007ffff65f2a4f in std::_Destroy<Node*, Node> (__first=0x614c60, 
    __last=0x614d40) at /usr/include/c++/4.6/bits/stl_construct.h:151


9  0x00007ffff65ecfb2 in std::vector < Node, std::allocator < Node>
>::~vector (
    this=0x7ffff68329f8, __in_chrg= < value optimized out>)
    at /usr/include/c++/4.6/bits/stl_vector.h:348

Answer 1

check 是静态的，这意味着它由该类的所有实例共享。由于您希望 check 成为普通类成员，因此应该删除 static 关键字。