is_volatile Class

Tests if type is volatile.

Syntax

template <class Ty>
struct is_volatile;

Parameters

Ty
The type to query.

Remarks

An instance of the type predicate holds true if Ty is volatile-qualified.

Example

// std__type_traits__is_volatile.cpp
// compile with: /EHsc
#include <type_traits>
#include <iostream>

struct trivial
    {
    int val;
    };

int main()
    {
    std::cout << "is_volatile<trivial> == " << std::boolalpha
        << std::is_volatile<trivial>::value << std::endl;
    std::cout << "is_volatile<volatile trivial> == " << std::boolalpha
        << std::is_volatile<volatile trivial>::value << std::endl;
    std::cout << "is_volatile<int> == " << std::boolalpha
        << std::is_volatile<int>::value << std::endl;
    std::cout << "is_volatile<volatile int> == " << std::boolalpha
        << std::is_volatile<volatile int>::value << std::endl;

    return (0);
    }

is_volatile<trivial> == false
is_volatile<volatile trivial> == true
is_volatile<int> == false
is_volatile<volatile int> == true

Requirements

Header: <type_traits>

Namespace: std

See also

<type_traits>
is_const Class