std::is_arithmetic (3) - Linux Manuals

std::is_arithmetic: std::is_arithmetic

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 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