std::is_floating_point (3) - Linux Manuals

std::is_floating_point: std::is_floating_point

NAME

std::is_floating_point - std::is_floating_point

Synopsis

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

Checks whether T is a floating-point type. Provides the member constant value which is equal to true, if T is the type float, double, long double, including any cv-qualified variants. Otherwise, value is equal to false.

Template parameters

T - a type to check

Helper variable template

template< class T > (since C++17)
inline constexpr bool is_floating_point_v = is_floating_point<T>::value;

Inherited from std::integral_constant

Member constants

value true if T is a floating-point type (possibly cv-qualified) , 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>

Possible implementation

  template< class T >
  struct is_floating_point
       : std::integral_constant<
           bool,
           std::is_same<float, typename std::remove_cv<T>::type>::value ||
           std::is_same<double, typename std::remove_cv<T>::type>::value ||
           std::is_same<long double, typename std::remove_cv<T>::type>::value
       > {};

Example

// Run this code

  #include <iostream>
  #include <type_traits>

  class A {};

  int main()
  {
      std::cout << std::boolalpha;
      std::cout << std::is_floating_point<A>::value << '\n';
      std::cout << std::is_floating_point<float>::value << '\n';
      std::cout << std::is_floating_point<int>::value << '\n';
  }

Output:

  false
  true
  false