Espaços nominais
Variantes
Acções

attribute specifier sequence(desde C++11)

Da cppreference.com
< cpp‎ | language

This page has been machine-translated from the English version of the wiki using Google Translate.

The translation may contain errors and awkward wording. Hover over text to see the original version. You can help to fix errors and improve the translation. For instructions click here.

Click here for the English version of this page

 
C++
 
Linguagem C++
Tópicos gerais
Original:
General topics
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Controle de fluxo
Original:
Flow control
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Declarações execução condicional
Original:
Conditional execution statements
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Instruções de iteração
Original:
Iteration statements
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Ir declarações
Original:
Jump statements
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Funções
Original:
Functions
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
declaração da função
lambda declaração da função
modelo de função
linha especificador
especificações de exceção (obsoleta)
noexcept especificador (C++11)
Exceções
Original:
Exceptions
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Namespaces
Original:
Namespaces
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Tipos
Original:
Types
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
decltype specifier (C++11)
Especificadores
Original:
Specifiers
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
cv especificadores
armazenamento duração especificadores
constexpr especificador (C++11)
auto especificador (C++11)
alignas especificador (C++11)
Inicialização
Original:
Initialization
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Literais
Original:
Literals
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Expressões
Original:
Expressions
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
representações alternativas
Utilitários
Original:
Utilities
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Tipos
Original:
Types
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
typedef declaration
tipo de alias declaração (C++11)
atributos (C++11)
Conversões
Original:
Casts
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
conversões implícitas
const_cast conversion
static_cast conversion
dynamic_cast conversion
reinterpret_cast conversion
Elenco C-estilo e funcional
Alocação de memória
Original:
Memory allocation
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Classes
Original:
Classes
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Classe propriedades específicas de função
Original:
Class-specific function properties
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Funções membro especiais
Original:
Special member functions
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Modelos
Original:
Templates
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
modelo de função
especialização de modelo
pacotes de parâmetros (C++11)
Diversos
Original:
Miscellaneous
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Assembly embutido
 
Introduz implementação atributos definidos para os tipos, objetos de código, etc
Original:
Introduces implementation-defined attributes for types, objects, code, etc.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
[[attr]] [[attr1, attr2, attr3(args)]] [[namespace::attr(args)]] alignas_specifier

[editar] Explicação

Atributos fornecer a sintaxe padrão unificado para aplicação definida extensões de linguagem, como a GNU e extensões de linguagem IBM __attribute__((...)), extensão da Microsoft __declspec(), etc
Original:
Attributes provide the unified standard syntax for implementation-defined language extensions, such as the GNU and IBM language extensions __attribute__((...)), Microsoft extension __declspec(), etc.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Um atributo pode ser usado em quase todo o programa em C + +, e pode ser aplicada a quase tudo: os tipos, para as variáveis, para as funções, para nomes, para blocos de código, para unidades de tradução inteiras, embora cada atributo especial só é válida onde é permitida pela aplicação: [[probably(true)]] só pode ser usado com um if, e não com uma declaração da classe. [[omp::parallel()]] pode ser aplicado a um bloco de código ou de um loop for, mas não para o tipo int, etc
Original:
An attribute can be used almost everywhere in the C++ program, and can be applied to almost everything: to types, to variables, to functions, to names, to code blocks, to entire translation units, although each particular attribute is only valid where it is permitted by the implementation: [[probably(true)]] can only be used with an if, and not with an class declaration. [[omp::parallel()]] can apply to a code block or to a for loop, but not to the type int, etc.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Em declarações, os atributos podem aparecer antes e logo após o nome da entidade que é declarada, caso em que eles são combinados. Nas restantes situações, os atributos se aplicam à entidade diretamente anterior.
Original:
In declarations, attributes may appear both before and directly after the name of the entity that is declared, in which case they are combined. In most other situations, attributes apply to the directly preceding entity.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
alignas_specifier é uma parte da sequência de especificador atributo, embora tenha sintaxe diferente. Pode verificar-se onde os atributos [[...]] aparecer e pode misturar-se com eles (desde que seja utilizado em alignas é permitida)
Original:
alignas_specifier is a part of the attribute specifier sequence, although it has different syntax. It may appear where the [[...]] attributes appear and may mix with them (provided it is used where alignas is permitted)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[editar] Atributos padrão

Apenas os dois seguintes atributos são definidos pelo padrão C + +. Todos os outros atributos são a implementação específica.
Original:
Only the following two attributes are defined by the C++ standard. All other attributes are implementation-specific.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
[[noreturn]]
Indica que a função não retorna.
Este atributo aplica-se a funcionar apenas as declarações. O comportamento é indefinido se a função com esse atributo na verdade, retorna.
The seguintes funções padrão tem esse atributo: std::_Exit, std::abort, std::exit, std::quick_exit, std::unexpected, std::terminate, std::rethrow_exception, std::throw_with_nested, std::rethrow_nested
Original:
Indicates that the function does not return.
This attribute applies to function declarations only. The behavior is undefined if the function with this attribute actually returns.
The following standard functions have this attribute: std::_Exit, std::abort, std::exit, std::quick_exit, std::unexpected, std::terminate, std::rethrow_exception, std::throw_with_nested, std::rethrow_nested
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
[[carries_dependency]]
Indica que a cadeia de dependência em liberação consumir std::memory_order propaga dentro e fora da função, o que permite ao compilador para ignorar desnecessária memória atributo instructions.
This cerca pode aparecer em duas situações:

1) que podem ser aplicadas às declarações de parâmetro de uma função ou expressões lambda-, caso em que se indica que a inicialização do parâmetro transporta dependência em lvalue para rvalue-conversão desse object.

2) pode ser aplicada à declaração da função como um todo, caso em que isso indica que o valor de retorno transporta dependência para a avaliação da expressão de chamada de função .
Original:
Indicates that dependency chain in release-consume std::memory_order propagates in and out of the function, which allows the compiler to skip unnecessary memory fence instructions.
This attribute may appear in two situations:

1) it may apply to the parameter declarations of a function or lambda-expressions, in which case it indicates that initialization of the parameter carries dependency into lvalue-to-rvalue conversion of that object.

2) It may apply to the function declaration as a whole, in which case it indicates that the return value carries dependency to the evaluation of the function call expression.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[editar] Exemplo

Esta seção está incompleta
Motivo: sem exemplo
Obtida de "https://pt.cppreference.com/mwiki/index.php?title=cpp/language/attributes&oldid=20896"