std::is_arithmetic

< cpp‎ | types
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

#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

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