std::is_arithmetic - cppreference.com (original) (raw)
| | | | | ------------------------------------------- | | ------------- | | template< class T > struct is_arithmetic; | | (since C++11) |
std::is_arithmetic is a UnaryTypeTrait.
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.
If the program adds specializations for std::is_arithmetic or std::is_arithmetic_v(since C++17), the behavior is undefined.
Contents
[edit] Template parameters
[edit] Helper variable template
| template< class T > constexpr bool is_arithmetic_v = is_arithmetic<T>::value; | | (since C++17) | | ----------------------------------------------------------------------------------- | | ------------- |
Inherited from std::integral_constant
Member constants
| | true if T is an arithmetic type, false otherwise (public static member constant) | | ----------------------------------------------------------------------------------- |
Member functions
| | converts the object to bool, returns value (public member function) | | ---------------------------------------------------------------------- | | | returns value (public member function) |
Member types
[edit] Notes
Arithmetic types are the built-in types for which the arithmetic operators (+, -, *, /) are defined (possibly in combination with the usual arithmetic conversions).
Specializations of std::numeric_limits are provided for all arithmetic types.
[edit] Possible implementation
[edit] Example
#include #include #include class A {}; enum class B : int { e }; static_assert( std::is_arithmetic_v == true and std::is_arithmetic_v == true and std::is_arithmetic_v == true and std::is_arithmetic_v == true and std::is_arithmetic_v == true and std::is_arithmetic_v == true and std::is_arithmetic_v == true and std::is_arithmetic_v<std::size_t> == true and std::is_arithmetic_v<char&> == false and std::is_arithmetic_v<char*> == false and std::is_arithmetic_v<int&> == false and std::is_arithmetic_v<int*> == false and std::is_arithmetic_v<float&> == false and std::is_arithmetic_v<float*> == false and std::is_arithmetic_v == false and std::is_arithmetic_v == false and std::is_arithmetic_v<decltype(B::e)> == false and std::is_arithmetic_v<std::byte> == false and std::is_arithmetic_v<std::atomic_int> == false ); int main() {}