C + +: A member function that is generated by default

C + + generates 4 member functions by default.

Default constructor (constructor), destructor (destructor), copy constructor (copy constructor), Assignment function (Assignment);

Where the destructor, the basic type data for C + + is automatically destructor.

"=default" means that the default is added and can be used for overloading; "=delete" means delete, that is, default is not used;

The following code mainly shows the generation of copy constructors and assignment functions.

Code:

* * * test.cpp * *  Created on:2014.04.14 * 
 author:spike/
      
/*eclipse CDT, gcc 4.8.1* /
      
#include <iostream>  
#include <string>  
      
using namespace std;  
      
class Foo {public  
:  
    foo (std::string _name): M_name (_name) {};  
    void Say () {std::cout << m_name << Std::endl;}  
    Foo (const foo&) = default; Delete indicates deletion, default  
    foo& operator= (const foo&) = defaults;  
    ~foo () = default;  
Private:  
    std::string m_name;  
      
int main () {  
    Foo F1 ("Wang");  
    Foo F2 (F1);  
    Foo F3 = F2;  
    F2.say ();  
    F3.say ();  
    return 0;  
}

Output:

Wang  
Wang

Author: csdn Blog spike_king

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