std::is_integral 是一元类型特征 (UnaryTypeTrait) 。 检查T 是否为整数类型。如果 T 是类型 bool、char、char8_t(C++20 起)、char16_t、char32_t、wchar_t、short、int、long、long long,或任何实现定义的扩展整数类型,包含任何有符号、无符号及 cv 限定的变体,那么提供的成员常量 value 等于true。否则...
整数类型(包括有cv 限定版本,参阅 std::is_integral): bool 类型; 字符类型: 窄字符类型: 普通字符类型:char、signed char、unsigned char[1] char8_t 类型 (C++20 起)宽字符类型:char16_t、char32_t、 (C++11 起)wchar_t; 有符号整数类型: 标准有符号整数类型:signed char、short int、int、...
Conjunction of constraints P and Q is specified as P && Q. // example concepts from the standard library (Ranges TS) template <class T> concept bool Integral = std::is_integral<T>::value; template <class T> concept bool SignedIntegral = Integral<T> && std::is_signed<T>::value; ...
The conjunction of two constraints is formed by using the && operator in the constraint expression: template<class T> concept Integral = std::is_integral<T>::value; template<class T> concept SignedIntegral = Integral<T> && std::is_signed<T>::value; template<class T> concept UnsignedInteg...
template< class T > struct is_arithmetic : std::integral_constant<bool, std::is_integral<T>::value || std::is_floating_point<T>::value> {}; Beispiel #include <iostream> #include <type_traits> class A {}; int main() { std::cout << std::boolalpha; std::cout << std::is_arit...
constexpr bool is_same_v = is_same<T, U>::value; (since C++17) Inherited from std::integral_constant Member constants value [static] true if T and U is the same type , false otherwise (public static member constant) Member functions operator bool converts the object to bool...
typestd::integral_constant<bool, value> Mögliche Implementierung template<classT>structis_floating_point:std::integral_constant<bool,std::is_same<float,typenamestd::remove_cv<T>::type>::value||std::is_same<double,typenamestd::remove_cv<T>::type>::value||std::is_same<longdouble,typena...
Inherited from std::integral_constant Member constants value [statico] true se T is an array type , false altrimenti Original: true if T is an array type , false otherwise The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click...
template< class T > struct is_arithmetic : std::integral_constant<bool, std::is_integral<T>::value || std::is_floating_point<T>::value> {}; Пример Запуститьэтоткод #include <atomic> #include <cstddef> #include <type_traits> class A {}; enum class B :...
Original: converts an integral or floating point value to wstring The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction) [edit] Litéralles Defined in namespace std::literals::string_literals operat...