NAME¶

std::is_arithmetic - std::is_arithmetic

Synopsis¶

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

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 is_arithmetic
or is_arithmetic_v
(since C++17) 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 <iostream>
#include <type_traits>

class A {};

int main()
{
std::cout << std::boolalpha
<< "A: " << std::is_arithmetic_v<A> << '\n' // false
<< "bool: " << std::is_arithmetic_v<bool> << '\n' // true
<< "int: " << std::is_arithmetic_v<int> << '\n' // true
<< "int const: " << std::is_arithmetic_v<int const> << '\n' // true
<< "int &: " << std::is_arithmetic_v<int&> << '\n' // false
<< "int *: " << std::is_arithmetic_v<int*> << '\n' // false
<< "float: " << std::is_arithmetic_v<float> << '\n' // true
<< "float const: " << std::is_arithmetic_v<float const> << '\n' // true
<< "float &: " << std::is_arithmetic_v<float&> << '\n' // false
<< "float *: " << std::is_arithmetic_v<float*> << '\n' // false
<< "char: " << std::is_arithmetic_v<char> << '\n' // true
<< "char const: " << std::is_arithmetic_v<char const> << '\n' // true
<< "char &: " << std::is_arithmetic_v<char&> << '\n' // false
<< "char *: " << std::is_arithmetic_v<char*> << '\n' // false
;
}

Output:¶

A: false
bool: true
int: true
int const: true
int &: false
int *: false
float: true
float const: true
float &: false
float *: false
char: true
char const: true
char &: false
char *: false

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)