# std::is_arithmetic

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Defined in header `<type_traits>` |  |
template< class T > struct is_arithmetic; |  | (since C++11)

`std::is_arithmetic` is an 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.

The behavior of a program that adds specializations for `std::is_arithmetic` or `std::is_arithmetic_v` (since C++17) is undefined.

### Template parameters

T | - | a type to check

### Helper variable template

template< class T > inline constexpr bool is_arithmetic_v = is_arithmetic<T>::value; |  | (since C++17)

## Inherited from std::integral_constant

### Member constants

value [static] | true if `T` is an arithmetic type, false otherwise (public static member constant)

### Member functions

operator bool | converts the object to bool, returns value (public member function)
operator() (C++14) | returns value (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 operators (+, -, *, /) are defined (possibly in combination with the usual arithmetic conversions).

Specializations of std::numeric_limits are provided for all arithmetic types.

### Possible implementation

    template<class T>
    struct is_arithmetic : std::integral_constant<bool,
                                                  std::is_integral<T>::value ||
                                                  std::is_floating_point<T>::value> {};

### Example

Run this code

    #include <type_traits>

    class A {};

    static_assert(
        std::is_arithmetic_v<A>           == false  and
        std::is_arithmetic_v<bool>        == true   and
        std::is_arithmetic_v<int>         == true   and
        std::is_arithmetic_v<int const>   == true   and
        std::is_arithmetic_v<int&>        == false  and
        std::is_arithmetic_v<int*>        == false  and
        std::is_arithmetic_v<float>       == true   and
        std::is_arithmetic_v<float const> == true   and
        std::is_arithmetic_v<float&>      == false  and
        std::is_arithmetic_v<float*>      == false  and
        std::is_arithmetic_v<char>        == true   and
        std::is_arithmetic_v<char const>  == true   and
        std::is_arithmetic_v<char&>       == false  and
        std::is_arithmetic_v<char*>       == false
    );

    int main() {}

### See also

is_integral (C++11) | checks if a type is an integral type (class template)
is_floating_point (C++11) | checks if a type is a floating-point type (class template)

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