std::is_floating_point (3) - Linux Man Pages

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

See also


is_iec559 identifies the IEC 559/IEEE 754 floating-point types
              (public static member constant of std::numeric_limits<T>)
[static]


is_integral checks if a type is an integral type
              (class template)
(C++11)


is_arithmetic checks if a type is an arithmetic type
              (class template)
(C++11)