Std::is_volatile (3) Linux Manual Page

std::is_volatile – std::is_volatile

Synopsis

Defined in header<type_traits>

    template <class T>
    (since C++ 11)

        struct is_volatile;

If T is a volatile-qualified type (that is, volatile, or const volatile), provides the member constant value equal true. For any other type, value is false.

Template parameters

T – a type to check

Helper variable template

template< class T > (since C++17)
inline constexpr bool is_volatile_v = is_volatile<T>::value;

Inherited from std::integral_constant

Member constants

value true if T is a volatile-qualified type , false otherwise
(public static member constant)
[static]

Member functions

converts the object to bool, returns value
operator bool (public member function)

operator() returns value
(public member function)
(C++14)

Member types

Type Definition
value_type bool
type std::integral_constant<bool, value>

Possible implementation

template<class T> struct is_volatile : std::false_type {};
template<class T> struct is_volatile<volatile T> : std::true_type {};

Example

// Run this code

#include <iostream>

#include <type_traits>
int main()

{
    std::cout << std::boolalpha;
    std::cout << std::is_volatile<int>::value << '\n';
    std::cout << std::is_volatile<volatile int>::value << '\n';
}

Output:

false
true

std::is_volatile (3) Linux Manual Page