std::is_floating_point

From Cppreference

Defined in header `<type_traits>`

template< class T > struct is_floating_point;		(C++11 feature)

If T is a floating-point type (float, double, long double, including any cv-qualified variants), provides the member constant value equal true. For any other type, value is false.

Inherited from std::integral_constant

Member constants


`value`	true if `T` is a floating-point type , false otherwise (public static member constant)

Member functions


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

Member types


Type	Definition

`value_type`	`bool`

`type`	std::integral_constant<bool, value>

[edit] Equivalent definition

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
                           > {};

[edit] Example

#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

[edit] See also

is_iec559

identifies the IEC 559/IEEE 754 floating-point types
(public static member constant)

is_integral (C++11)

checks if a type is integral type
(class template)

is_arithmetic (C++11)

checks if a type is arithmetic type
(class template)