std::uses_allocator - cppreference.com

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Definido no cabeçalho `<memory>`

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

Se T tem um membro allocator_type typedef que é convertível de Alloc, fornece o membro constante igual a value true. Caso contrário value é 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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Herdado de std::integral_constant

Member constants


	`true` se `T` uses allocator `Alloc`, `false` contrário 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. (membro estático público constante)

Member functions


	converte o objeto em `bool`, retorna `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. (função pública membro)

Member types


Tipo 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>`

Especializações

Especializações personalizados do traço tipo std::uses_allocator são permitidos para tipos que não têm o allocator_type membro typedef mas satisfazer um dos seguintes requisitos:

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 tem um construtor que leva std::allocator_arg_t como o primeiro argumento, e Alloc como segundo argumento.

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 tem um construtor que leva Alloc como último argumento.

Original:

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

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Os seguintes especializações já são fornecidas pela biblioteca padrão:

Original:

The following specializations are already provided by the standard library:

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std::uses_allocator<std::tuple> (C++11)	especializa o traço tipo std::uses_allocator 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. (especialização modelo. classe) [edit]

std::uses_allocator<std::queue> (C++11)	especializa o traço tipo std::uses_allocator 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. (modelo de função) [edit]

std::uses_allocator<std::priority_queue> (C++11)	especializa o traço tipo std::uses_allocator 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. (modelo de função) [edit]

std::uses_allocator<std::stack> (C++11)	especializa o traço tipo std::uses_allocator 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. (modelo de função) [edit]

std::uses_allocator<std::function> (C++11)	especializa o traço tipo std::uses_allocator 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. (especialização modelo. classe) [edit]

std::uses_allocator<std::promise> (C++11)	especializa o traço tipo std::uses_allocator 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. (especialização modelo. classe) [edit]

std::uses_allocator<std::packaged_task> (C++11)	especializa o traço tipo std::uses_allocator 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. (especialização modelo. classe) [edit]

Notas

Esta característica tipo é utilizado por std::scoped_allocator_adaptor e pode ser usado por allocators personalizados para determinar se o objecto a ser construído é-se capaz de usar um alocador (por exemplo, é um recipiente), caso em que um alocador devem ser passados para o construtor.

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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Veja também


allocator_arg (C++11)	um objeto de std::allocator_arg_t tipo usado para selecionar alocador de reconhecimento de construtores Original: an object of type std::allocator_arg_t used to select allocator-aware constructors The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (constante) [edit]

allocator_arg_t (C++11)	tipo de etiqueta usada para selecionar sobrecargas alocador de reconhecimento do construtor Original: tag type used to select allocator-aware constructor overloads The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (classe) [edit]

scoped_allocator_adaptor (C++11)	implementa multi-nível alocador de multi-nível de contêineres Original: implements multi-level allocator for multi-level containers The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de classe) [edit]