转换函数删除类对象？

Question

是否可以为返回一个指针的类编写一个转换函数，哪个也可以被删除表达式用来删除我的对象？如果是这样，我该怎么做？

Answer 1

要使X工作，X必须是原始对象的类型（或共享基类型w /虚拟析构函数）。所以通常情况下，你永远不需要这样的操作符，因为它只有在你进行隐式强制转换时才会有效，不需要转换操作符。

而对于其他任何答案都是有效的“否”。

class Base 
{ 
public: 
    virtual ~Base() {} 
}; 

class Thing1 : public Base 
{ 
public: 
    ... whatever ... 
} 

class Thing2 : public Base 
{ 
public: 
    ... 
} 

你可以做的东西：

Thing1 * t = new Thing1; 
Base * b = t; // okay 
delete b; // okay, deletes b (which is also t) 
      // BECAUSE we provided a virtual dtor in Base, 
      // otherwise a form of slicing/memory loss/bad stuff would occur here; 
Thing2 * t2 = new Thing2; 
Thing1 * t1 = t2; // error: won't compile (a t2 is not a t1) 
        // and even if we cast this into existence, 
        // or created an operator that provided this 
        // it would be "undefined behavior" - 
        // not "can be deleted by delete operator"