std::is_floating_point
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<metanoindex/>
<tbody> </tbody>| definiert in Header <type_traits>
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template< class T > struct is_floating_point; |
(seit C++11) | |
Wenn
T eine Floating-Point-Typ (float, double, long double, einschließlich etwaiger cv qualifizierte Varianten) ist, stellt das Mitglied konstanten value gleich true. Für jede andere Art, value ist false .Original:
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.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Inherited from std::integral_constant
Member constants
value [statisch] |
true wenn T is a floating-point type , false anders Original: true if T is a floating-point type , false otherwise The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten) |
Member functions
operator bool |
wandelt das Objekt bool, gibt value Original: converts the object to bool, returns value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (öffentliche Elementfunktion) |
Member types
Type
Original: Type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
Definition |
value_type
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bool
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type
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std::integral_constant<bool, value>
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Mögliche Implementierung
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
> {};
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Beispiel
#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