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std::is_volatile(3) C++ Standard Libary std::is_volatile(3) 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 to true. For any other type, value is false. The behavior of a program that adds specializations for is_volatile or is_volatile_v (since C++17) is undefined. 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 [static] (public static member constant) Member functions operator bool converts the object to bool, returns value (public member function) operator() returns value (C++14) (public member function) 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 See also is_const checks if a type is const-qualified (C++11) (class template) http://cppreference.com 2022.07.31 std::is_volatile(3)
NAME | Synopsis | Template parameters | Member constants | Member functions | Member types | Possible implementation | Example | Output: | See also
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