std::is_arithmetic(3)

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)