鸿 网 互 联 www.68idc.cn

当前位置 : 服务器租用 > 编程语言开发 > c++ > >

Type of this pointer in C++

来源:互联网 作者:佚名 时间:2013-11-29 10:37
In C++, this pointer is passed as a hidden argument to all non-static member function calls. The type of this depends upon function declaration. If the member function of a class X is declared const, the type of this is const X* (see code

 

  

  In C++, this pointer is passed as a hidden argument to all non-static member function calls. The type of this depends upon function declaration. If the member function of a class X is declared const, the type of this is const X* (see code 1 below), if the member function is declared volatile, the type of this is volatile X* (see code 2 below), and if the member function is declared const volatile, the type of this is const volatile X* (see code 3 below).

  Code 1

1 #include<iostream> 2 class X 3 { { 6 // this is passed as hidden argument to fun(). } 9 };

 

  Code 2

1 #include<iostream> 2 class X 3 { { 6 // this is passed as hidden argument to fun(). } 9 };

 

  Code 3

1 #include<iostream> 2 class X 3 { { 6 // this is passed as hidden argument to fun(). } 9 };

 

  补充:

  (1)In an ordinary nonconst member function, the type of this is a const pointer to the class type. We may change the value to which this points but cannot change the address that this holds. In a const member function, the type of this is a const pointer to a const class - type object. We may change neither the object to which this points nor the address that this holds.

  (2)What is the purpose of a volatile member function in C++?【from stackoverflow】

  

 

 

  References:

 

  Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.
      

  转载请注明:  

  2013-11-26  09:32:58

网友评论
<