std::is_floating_point – cppreference.com

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definiert in Header `<type_traits>`

`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.

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Inherited from std::integral_constant

Member constants


	`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


	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`	`bool`

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

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
                           > {};

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:

Siehe auch


is_iec559 [statisch]	identifiziert die IEC 559/IEEE 754 Floating-Point-Typen Original: identifies the IEC 559/IEEE 754 floating-point types 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 of `std::numeric_limits`) [edit]

is_integral (C++11)	prüft, ob ein Typ ist integraler Typ Original: checks if a type is integral type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Klassen-Template) [edit]

is_arithmetic (C++11)	prüft, ob ein Typ ist arithmetischen Typ Original: checks if a type is arithmetic type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Klassen-Template) [edit]