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std::is_arithmetic(3) C++ Standard Libary std::is_arithmetic(3) NAME std::is_arithmetic - std::is_arithmetic Synopsis Defined in header <type_traits> template< class T > (since C++11) struct is_arithmetic; If T is an arithmetic type (that is, an integral type or a floating- point type) or a cv-qualified version thereof, 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_arith- metic or is_arithmetic_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_arithmetic_v = is_arithmetic<T>::value; Inherited from std::integral_constant Member constants value true if T is an arithmetic 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> Notes Arithmetic types are the built-in types for which the arithmetic op- erators (+, -, *, /) are defined (possibly in combination with the usual arithmetic conversions) Specializations of std::numeric_limits are provided for all arith- metic types. Possible implementation template< class T > struct is_arithmetic : std::integral_constant<bool, std::is_inte- gral<T>::value || std::is_float- ing_point<T>::value> {}; Example // Run this code #include <iostream> #include <type_traits> class A {}; int main() { std::cout << std::boolalpha << "A: " << std::is_arithmetic_v<A> << '\n' // false << "bool: " << std::is_arithmetic_v<bool> << '\n' // true << "int: " << std::is_arithmetic_v<int> << '\n' // true << "int const: " << std::is_arithmetic_v<int const> << '\n' // true << "int &: " << std::is_arithmetic_v<int&> << '\n' // false << "int *: " << std::is_arithmetic_v<int*> << '\n' // false << "float: " << std::is_arithmetic_v<float> << '\n' // true << "float const: " << std::is_arithmetic_v<float const> << '\n' // true << "float &: " << std::is_arithmetic_v<float&> << '\n' // false << "float *: " << std::is_arithmetic_v<float*> << '\n' // false << "char: " << std::is_arithmetic_v<char> << '\n' // true << "char const: " << std::is_arithmetic_v<char const> << '\n' // true << "char &: " << std::is_arithmetic_v<char&> << '\n' // false << "char *: " << std::is_arithmetic_v<char*> << '\n' // false ; } Output: A: false bool: true int: true int const: true int &: false int *: false float: true float const: true float &: false float *: false char: true char const: true char &: false char *: false See also is_integral checks if a type is an integral type (C++11) (class template) is_floating_point checks if a type is a floating-point type (C++11) (class template) http://cppreference.com 2022.07.31 std::is_arithmetic(3)
NAME | Synopsis | Template parameters | Member constants | Member functions | Member types | Notes | Possible implementation | Example | Output: | See also
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