list initialization
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Inicializa um objeto de braced-init-lista
Original:
Initializes an object from braced-init-list
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Sintaxe
T object { arg1, arg2, ... };
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T { arg1, arg2, ... };
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new T { arg1, arg2, ... };
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return { arg1, arg2, ... } ;
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function( { arg1, arg2, ... } ) ;
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object[ { arg1, arg2, ... } ] ;
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T( { arg1, arg2, ... } )
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Class { T member = { arg1, arg2, ... }; };
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Class::Class() : member{arg1, arg2, ...} {...
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T object = {arg1, arg2, ...};
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Explicação
Lista de inicialização é realizada nas seguintes situações:
Original:
List initialization is performed in the following situations:
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1)
inicialização de uma variável chamada com uma lista cinta-fechado de expressões ou listas aninhadas (preparou-init-list)
Original:
initialization of a named variable with a brace-enclosed list of expressions or nested lists (braced-init-list)
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2)
inicialização de um temporário sem nome com uma lista apoiou-init
Original:
initialization of an unnamed temporary with a braced-init-list
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3)
inicialização de um objeto com duração de armazenamento dinâmico, com uma expressão nova, onde o inicializador é uma cinta-init-lista
Original:
initialization of an object with dynamic storage duration with a new-expression, where the initializer is a brace-init-list
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4)
em comunicado
return com braced-init-lista usada como a expressão de retornoOriginal:
in a
return statement with braced-init-list used as the return expressionThe text has been machine-translated via Google Translate.
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5)
em uma expressão chamada de função, com preparei-init-list usado como um argumento
Original:
in a function call expression, with braced-init-list used as an argument
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6)
em uma expressão subscrito com um operador definido pelo usuário []
Original:
in a subscript expression with a user-defined operator[]
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7)
em uma expressão de conversão funcional ou outro inicialização-direta, com preparei-init-lista usado como o argumento do construtor
Original:
in a functional cast expression or other direct-initialization, with braced-init-list used as the constructor argument
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8)
em um inicializador de membro não-estático de dados
Original:
in a non-static data member initializer
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9)
em uma lista de inicializador construtor
Original:
in a constructor initializer list
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10)
no lado direito do sinal de igual (semelhante ao cópia de inicialização)
Original:
on the right-hand-side of the equals sign (similar to cópia de inicialização)
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Os efeitos da inicialização lista de um objeto de
T tipo são:Original:
The effects of list initialization of an object of type
T are:The text has been machine-translated via Google Translate.
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- Se a lista braced-init-se vazio e
Té um tipo de classe com um construtor padrão, valor de inicialização é realizada.Original:If the braced-init-list is empty andTis a class type with a default constructor, valor de inicialização is performed.The text has been machine-translated via Google Translate.
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- Caso contrário, se
Té um tipo de agregado, inicialização agregada é realizado.Original:Otherwise, ifTis an aggregate type, inicialização agregada is performed.The text has been machine-translated via Google Translate.
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- Caso contrário, se
Té uma especialização de std::initializer_list, um objetostd::initializer_listnovo do mesmo tipo é construído e usado para dirigir-inicializar ou copiar-inicializar o objeto deTtipo, dependendo do contexto.Original:Otherwise, ifTis a specialization of std::initializer_list, a newstd::initializer_listobject of the same type is constructed and used to direct-initialize or copy-initialize the object of typeT, depending on context.The text has been machine-translated via Google Translate.
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- Caso contrário, os constuctors de
Tsão considerados, em duas fases:Original:Otherwise, the constuctors ofTare considered, in two phases:The text has been machine-translated via Google Translate.
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- Todos os construtores que levam std::initializer_list como o único argumento, ou como o primeiro argumento, se os argumentos restantes têm valores padrão, são examinados, e acompanhado por resolução de sobrecarga contra um único argumento do tipo std::initializer_listOriginal:All constructors that take std::initializer_list as the only argument, or as the first argument if the remaining arguments have default values, are examined, and matched by overload resolution against a single argument of type std::initializer_listThe text has been machine-translated via Google Translate.
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- Se a etapa anterior não produz uma partida, todos os construtores de
Tparticipar de resolução de sobrecarga em relação ao conjunto de argumentos que consiste nos elementos da braced-lista-init, com a restrição de que apenas conversões de estreitamento são permitidos. Se nesta fase produz um construtor explícito como o melhor para uma cópia de lista de inicialização, compilação falhar (nota, em simples cópia de inicialização, construtores explícitos não são consideradas em todos)Original:If the previous stage does not produce a match, all constructors ofTparticipate in overload resolution against the set of arguments that consists of the elements of the braced-init-list, with the restriction that only narrowing conversions are allowed. If this stage produces an explicit constructor as the best match for a copy-list-initialization, compilation fails (note, in simple copy-initialization, explicit constructors are not considered at all)The text has been machine-translated via Google Translate.
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