std::is_compound – cppreference.com

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definiert in Header `<type_traits>`

`template< class T > struct is_compound;`		(seit C++11)

Wenn T eine Verbindung Typ (dh Array, Funktion, Objekt-Pointer, Funktion Zeiger, Mitglied Objektzeiger, Member-Funktion Zeiger, eine Referenz, Klasse, Gewerkschaft oder Enumeration, einschließlich etwaiger cv qualifizierte Varianten) bietet, das Mitglied konstanten value gleich true. Für jede andere Art, value ist false .

Original:

If T is a compound type (that is, array, function, object pointer, function pointer, member object pointer, member function pointer, reference, class, union, or enumeration, 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 compound type , `false` anders Original: `true` if `T` is a compound 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>`

Notes

Compound-Typen sind die Typen, die von Grundtypen aufgebaut sind. Jede C + + ist entweder grundlegende oder Verbindung .

Original:

Compound types are the types that are constructed from fundamental types. Any C++ type is either fundamental or compound.

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Mögliche Implementierung

template< class T >
struct is_compound : std::integral_constant<bool, !std::is_fundamental<T>::value> {};

Beispiel

#include <iostream>
#include <type_traits>

int main() {
    class cls {};
    std::cout << (std::is_compound<cls>::value
                     ? "T is compound"
                     : "T is not a compound") << '\n';
    std::cout << (std::is_compound<int>::value
                     ? "T is compound"
                     : "T is not a compound") << '\n';
}

Output:

T is compound
T is not a compound

Siehe auch


is_fundamental (C++11)	prüft, ob ein Typ ist Grundtypus Original: checks if a type is fundamental 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_scalar (C++11)	prüft, ob ein Typ ist skalaren Typ Original: checks if a type is scalar 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_object (C++11)	prüft, ob ein Typ ist Objekttyp Original: checks if a type is object 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_array (C++11)	prüft, ob ein Typ ist ein Array-Typ Original: checks if a type is an array 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]