std::is_volatile (3) - Linux Manuals

std::is_volatile: std::is_volatile

NAME

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