add_volatile Class

Makes a volatile type from the specified type.

Syntax

template <class Ty>
struct add_volatile;

template <class T>
using add_volatile_t = typename add_volatile<T>::type;

Parameters

T
The type to modify.

Remarks

An instance of add_volatile<T> has a member typedef type that is T if T is a reference, a function, or a volatile-qualified type, otherwise volatile T. The alias add_volatile_t is a shortcut to access the member typedef type.

Example

#include <type_traits>
#include <iostream>

int main()
{
    std::add_volatile_t<int> *p = (volatile int *)0;

    p = p;  // to quiet "unused" warning
    std::cout << "add_volatile<int> == "
        << typeid(*p).name() << std::endl;

    return (0);
}

add_volatile<int> == int

Requirements

Header: <type_traits>

Namespace: std

See also

<type_traits>
remove_volatile Class