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
.
T | - | a type to check |
template< class T > inline constexpr bool is_floating_point_v = is_floating_point<T>::value; | (since C++17) |
value
[static] | true if T is a floating-point type (possibly cv-qualified) , false otherwise (public static member constant) |
operator bool | converts the object to bool , returns value (public member function) |
operator()
(C++14) | returns value (public member function) |
Type | Definition |
---|---|
value_type | bool |
type | std::integral_constant<bool, value> |
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 > {}; |
#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
[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) |
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