std::uses_allocator – cppreference.com

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definiert in Header `<memory>`

`template< class T, class Alloc > struct uses_allocator`		(seit C++11)

Wenn T ein Mitglied typedef allocator_type die Cabrio von Alloc ist, hat, stellt das Mitglied konstanten value gleich true. Ansonsten value ist false .

Original:

If T has a member typedef allocator_type which is convertible from Alloc, provides the member constant value equal to true. Otherwise value is false.

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Inherited from std::integral_constant

Member constants


	`true` wenn `T` uses allocator `Alloc`, `false` anders Original: `true` if `T` uses allocator `Alloc`, `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>`

Spezialisierungen

Benutzerdefinierte Spezialisierungen des Typs trait std::uses_allocator sind für Typen, die nicht das Mitglied typedef allocator_type die aber eine der beiden folgenden Anforderungen erlaubt:

Original:

Custom specializations of the type trait std::uses_allocator are allowed for types that do not have the member typedef allocator_type but satisfy one of the following two requirements:

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T hat einen Konstruktor, std::allocator_arg_t nimmt als erstes Argument und Alloc als zweites Argument .

Original:

T has a constructor which takes std::allocator_arg_t as the first argument, and Alloc as the second argument.

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T hat einen Konstruktor, Alloc erfolgt als letztes Argument .

Original:

T has a constructor which takes Alloc as the last argument.

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Die folgenden Spezialisierungen sind bereits von der Standard-Bibliothek zur Verfügung:

Original:

The following specializations are already provided by the standard library:

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std::uses_allocator<std::tuple> (C++11)	spezialisiert die std::uses_allocator Typ Merkmal Original: specializes the std::uses_allocator type trait The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (class Template-Spezialisierung) [edit]

std::uses_allocator<std::queue> (C++11)	spezialisiert die std::uses_allocator Typ Merkmal Original: specializes the std::uses_allocator type trait The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktions-Template) [edit]

std::uses_allocator<std::priority_queue> (C++11)	spezialisiert die std::uses_allocator Typ Merkmal Original: specializes the std::uses_allocator type trait The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktions-Template) [edit]

std::uses_allocator<std::stack> (C++11)	spezialisiert die std::uses_allocator Typ Merkmal Original: specializes the std::uses_allocator type trait The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktions-Template) [edit]

std::uses_allocator<std::function> (C++11)	spezialisiert das std::uses_allocator Typenmerkmal (type trait) (class Template-Spezialisierung) [edit]

std::uses_allocator<std::promise> (C++11)	spezialisiert die std::uses_allocator Typ Merkmal Original: specializes the std::uses_allocator type trait The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (class Template-Spezialisierung) [edit]

std::uses_allocator<std::packaged_task> (C++11)	spezialisiert die std::uses_allocator Typ Merkmal Original: specializes the std::uses_allocator type trait The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (class Template-Spezialisierung) [edit]

Notes

Diese Art Merkmal wird durch std::scoped_allocator_adaptor eingesetzt und kann durch individuelle Zuordnern verwendet werden, um zu bestimmen, ob das Objekt aufgebaut sich geeignet ist, unter Verwendung einer Zuweisungseinrichtung (zB ist ein Container), in welchem Fall eine Zuweisungseinrichtung an den Konstruktor übergeben werden müssen .

Original:

This type trait is used by std::scoped_allocator_adaptor and may be used by custom allocators to determine whether the object being constructed is itself capable of using an allocator (e.g. is a container), in which case an allocator should be passed to its constructor.

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Siehe auch


allocator_arg (C++11)	eine Konstante, um Konstruktoren, die Allokatoren unterstützen, auswählen zu können (konstanten) [edit]

allocator_arg_t (C++11)	Type zur Auswahl der Konstruktorüberladungen mit Allokatorunterstützung (Klasse) [edit]

scoped_allocator_adaptor (C++11)	implementiert die Zuweisung über mehrere Ebenen für Container, die in mehrfachen Ebene unterteilt sind (Klassen-Template) [edit]