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std::chrono::is_clock(3) C++ Standard Libary std::chrono::is_clock(3) NAME std::chrono::is_clock - std::chrono::is_clock Synopsis Defined in header <chrono> template< class T > (since C++20) struct is_clock; If T satisfies the Clock requirements, provides the member constant value equal true. For any other type, value is false. For the purpose of this trait, the extent to which an implementation determines that a type cannot meet the Clock requirements is unspecified, except that a minimum T shall not qualify as a Clock unless it meets all of the following conditions: * The qualified-ids T::rep, T::period, T::duration, and T::time_point are all valid and each denotes a type; * The expressions T::is_steady and T::now() are each well-formed when treated as an unevaluated operand. The behavior of a program that adds specializations for is_clock or is_clock_v is undefined. Template parameters T - a type to check Helper variable template template< class T > (since C++20) inline constexpr bool is_clock_v = is_clock<T>::value; Inherited from std::integral_constant Member constants value true if T satisfies the Clock requirements , false other- wise [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> struct is_clock : std::false_type {}; template<class T> requires requires { typename T::rep; typename T::period; typename T::duration; typename T::time_point; T::is_steady; T::now(); } struct is_clock<T> : std::true_type {}; http://cppreference.com 2022.07.31 std::chrono::is_clock(3)
NAME | Synopsis | Template parameters | Member constants | Member functions | Member types | Possible implementation
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