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 Codeint 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/
