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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 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

T - a type to check

[edit] Helper variable template

template< class T >
constexpr bool is_arithmetic_v = is_arithmetic<T>::value;
 (since C++17)
[edit]

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>

[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

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

[edit] Example

Run this code
#include <atomic>
#include <cstddef>
#include <type_traits>
 
class A {};
 
enum class B : int { e };
 
static_assert(
    std::is_arithmetic_v<bool>            == true  and
    std::is_arithmetic_v<char>            == true  and
    std::is_arithmetic_v<char const>      == true  and
    std::is_arithmetic_v<int>             == true  and
    std::is_arithmetic_v<int const>       == true  and
    std::is_arithmetic_v<float>           == true  and
    std::is_arithmetic_v<float const>     == 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<A>               == false and
    std::is_arithmetic_v<B>               == 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() {}

[edit] See also

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