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
#include<iostream> class X { void fun() const { // this is passed as hidden argument to fun(). // Type of this is const X* const } }; |
Code 2
#include<iostream> class X { void fun() volatile { // this is passed as hidden argument to fun(). // Type of this is volatile X* const } }; |
Code 3
#include<iostream> class X { void fun() const volatile { // this is passed as hidden argument to fun(). // Type of this is const volatile X* const } }; |
References:
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1905.pdf
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