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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; std::is_volatile is a UnaryTypeTrait. 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. If the program adds specializations for std::is_volatile or std::is_volatile_v, the behavior 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 <type_traits> #include <valarray> static_assert(!std::is_volatile_v<int>); static_assert(std::is_volatile_v<volatile int>); static_assert(std::is_volatile_v<volatile const int>); static_assert(std::is_volatile_v<volatile std::valarray<float>>); static_assert(!std::is_volatile_v<std::valarray<volatile float>>); int main() {} See also is_const checks if a type is const-qualified (C++11) (class template) http://cppreference.com 2024.06.10 std::is_volatile(3)
NAME | Synopsis | Template parameters | Member constants | Member functions | Member types | Possible implementation | Example | See also
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