Std::is_arithmetic (3) Linux Manual Page

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 true. For any other type, value is false.

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
(public static member constant)
[static]

Member functions

converts the object to bool, returns value
operator bool (public member function)

operator() returns value
(public member function)
(C++14)

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;
    std::cout << "A:           " << std::is_arithmetic<A>::value << '\n';
    std::cout << "bool:        " << std::is_arithmetic<bool>::value << '\n';
    std::cout << "int:         " << std::is_arithmetic<int>::value << '\n';
    std::cout << "int const:   " << std::is_arithmetic<int const>::value << '\n';
    std::cout << "int &:       " << std::is_arithmetic<int &>::value << '\n';
    std::cout << "int *:       " << std::is_arithmetic<int *>::value << '\n';
    std::cout << "float:       " << std::is_arithmetic<float>::value << '\n';
    std::cout << "float const: " << std::is_arithmetic<float const>::value << '\n';
    std::cout << "float &:     " << std::is_arithmetic<float &>::value << '\n';
    std::cout << "float *:     " << std::is_arithmetic<float *>::value << '\n';
    std::cout << "char:        " << std::is_arithmetic<char>::value << '\n';
    std::cout << "char const:  " << std::is_arithmetic<char const>::value << '\n';
    std::cout << "char &:      " << std::is_arithmetic<char &>::value << '\n';
    std::cout << "char *:      " << std::is_arithmetic<char *>::value << '\n';
}

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

std::is_arithmetic (3) Linux Manual Page