std::is_floating_point
From cppreference.com
| Defined in header <type_traits>
|
||
| template< class T > struct is_floating_point; |
(since C++11) | |
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 > inline constexpr bool is_floating_point_v = is_floating_point<T>::value; |
(since C++17) | |
Inherited from std::integral_constant
Member constants
| value [static] |
true if T is a floating-point type (possibly cv-qualified) , false otherwise (public static member constant) |
Member functions
| operator bool |
converts the object to bool, returns value (public member function) |
| operator() (C++14) |
returns value (public member function) |
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
| [static] |
identifies the IEC 559/IEEE 754 floating-point types (public static member constant of std::numeric_limits<T>) |
| (C++11) |
checks if a type is an integral type (class template) |
| (C++11) |
checks if a type is an arithmetic type (class template) |