std::add_volatile in C++ with Examples

The std::add_volatile template of C++ STL is present in the <type_traits> header file. The std::add_volatile template of C++ STL is used to get the type T with volatile qualification. The function std::is_volatile is used to check if type T is volatile qualified or not.

Header File:

#include<type_traits>

Template Class:

template < class T >
struct add_volatile;

Syntax:

std::add_volatile<T>::value

Parameter: The template std::add_volatile accepts a single parameter T(Trait class) which is used to get the type T with volatile qualification.

Below is the program to demonstrate std::add_volatile: in C++:

Program:

// C++ program to illustrate 
// std::add_volatile 
#include <bits/stdc++.h> 
#include <type_traits> 
using namespace std; 
  
// Driver Code 
int main() 
{ 
  
    // Declare variable of type 
    // volatile (int, const int, const int*, 
    // int * const and const int&) 
    typedef add_volatile<int>::type A; 
    typedef add_volatile<volatile int>::type B; 
    typedef add_volatile<int* volatile>::type C; 
    typedef add_volatile<volatile int*>::type D; 
    typedef add_volatile<volatile int&>::type E; 
  
    cout << boolalpha; 
  
    // Checking the volatileness of 
    // the above declared variable 
    cout << "checking volatileness:"
         << endl; 
  
    cout << "A: "
         << is_volatile<A>::value 
         << endl; 
  
    cout << "B: "
         << is_volatile<B>::value 
         << endl; 
  
    cout << "C: "
         << is_volatile<C>::value 
         << endl; 
  
    cout << "D: "
         << is_volatile<D>::value 
         << endl; 
  
    cout << "E: "
         << is_volatile<E>::value 
         << endl; 
  
    return 0; 
} 

Output:

checking volatileness:
A: true
B: true
C: true
D: true
E: false

Reference: http://www.cplusplus.com/reference/type_traits/add_volatile/

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