我们可以在构造函数中使用“this”指针 [英] Can we use 'this' pointer inside constructor

问题描述

可能重复：

C ++在构造函数中使用此指针

标题，我可以像下面的代码一样做吗？

  class A; 
 
 B类{
 public：
 B（A * p）; 
 ... 
}; 
 
 A类{
 B m; 
 public：
 A（）：m（this）{} 
〜A（）{} 
}; 
  

解决方案

Possible Duplicate:
C++ using this pointer in constructors

Like the title, may I do something like the following code?

class A;

class B {
public:
    B(A* p);
    ...
};

class A {
    B m;
public:
    A():m(this){}
    ~A(){}
};

解决方案

Yes, you can passed a pointer to an object currently under construction. But you have to keep in mind, that the object isn't constructed completely yet. So basically what B can do in it's c'tor is store the pointer for later use.

An example where this is often used, is a std::stream and a stream buffer.

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