NAME¶

std::is_arithmetic - std::is_arithmetic

Synopsis¶

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

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.

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 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 <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() {}

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)