C++ 中的智能指针使用共享对象验证

发布于 2024-12-09 13:21:50 字数 752 浏览 0 评论 0原文

我需要智能指针类或模板，它可以在“删除”发生后使其引用对象无效。关键点是使指针可用于多线程应用程序的调试。

这是一个例子，只是伪代码：

void foo1(smart_ptr<myclass> ptr)
{
    //some code
    delete ptr;
    //some other code
}

void foo2(smart_ptr<myclass> ptr)
{
    //some code
    function_wich_uses_ptr(ptr);
    //some other code
}


int main()
{
    myclass val = new myclass();
    smart_ptr<myclass> ptr(&val);
    //somehow make a copy of ptr
    smart_ptr<myclass> ptr2(ptr);
    //some code
    thread_start(foo1, ptr);
    thread_start(foo2, ptr2);
    //
    return 0;
}

所以，我需要 foo2 以某种方式跟踪 foo1 是否已经删除了引用 ptr 的对象。一般来说，在任何指向单个对象的“活动”智能指针删除该对象之后，指向同一对象的所有其他指针都应该以某种方式“感觉到”它并将其自己的值设置为 NULL。

UPD 我的错，示例不正确

原文

I need smart pointer class or template, which can invalidate it's referencing object after 'delete' happens. Key point is to make pointer usable in debug for multy-thread apps.

Here is an example, just pseudocode:

void foo1(smart_ptr<myclass> ptr)
{
    //some code
    delete ptr;
    //some other code
}

void foo2(smart_ptr<myclass> ptr)
{
    //some code
    function_wich_uses_ptr(ptr);
    //some other code
}


int main()
{
    myclass val = new myclass();
    smart_ptr<myclass> ptr(&val);
    //somehow make a copy of ptr
    smart_ptr<myclass> ptr2(ptr);
    //some code
    thread_start(foo1, ptr);
    thread_start(foo2, ptr2);
    //
    return 0;
}

So, I need foo2 somehow to track if foo1 has already deleted object referenced to ptr.
In general - after anyone of 'living' smart pointers to a single obect deletes that object, all the other pointers to the same object should somehow 'feel' it and set it's own value to NULL.

UPD my bad, example was incorrect

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