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Pointer types

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Revision as of 15:10, 3 December 2012 by Nate (Talk | contribs)

 
 
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Contents

Syntax

Template:sparam Template:sparam * Template:sparam Template:sparam (1)
Template:sparam ( * Template:sparam ) ( Template:sparam ) (2)
Template:sparam ( Template:sparam :: * Template:sparam ) ( Template:sparam ) Template:sparam (3)
Template:sparam & Template:sparam (4)
Template:sparam && Template:sparam (5) (since C++11)

Explanation

  1. Pointer to data
  2. Pointer to function
  3. Pointer to member function
  4. Reference
  5. r-value reference

Notes

Syntax meaning
const T * pointer to constant object
T const * pointer to constant object
T * const constant pointer to object
const T * const constant pointer to constant object
const T & reference to constant object

Example

#include <iostream>
 
struct Class
{
    int data_member;
 
    void member_function(int i) const
    {
        std::cout << "Member function: " << i << std::endl;
    }
 
    static void static_member_function ( int i )
    {
        std::cout << "Static member function: " << i << std::endl;
    }
};
 
void global_function ( int i )
{
        std::cout << "Global function: " << i << std::endl;
}
 
int main()
{
    Class object;
 
    Class *ptr = &object;
    ptr->member_function(1);
 
    Class &ref = object;
    ref.data_member = 2;
    std::cout << "object.data_member = " << object.data_member << std::endl;
 
    void (Class::*ptr_to_memfun)(int) const = &Class::member_function;
    (object.*ptr_to_memfun)(3);
    (ptr->*ptr_to_memfun)(4);
 
    void (*ptr_to_fun)(int) = Class::static_member_function;
    ptr_to_fun(5);
 
    ptr_to_fun = global_function;
    ptr_to_fun(6);
 
}

Output:

Member function: 1
object.data_member = 2
Member function: 3
Member function: 4
Static member function: 5
Global function: 6