Espaços nominais
Variantes
Acções

cv (<div class="t-tr-text">const volatilidade<div class="t-tr-dropdown"><div><div><div class="t-tr-dropdown-arrow-border"></div><div class="t-tr-dropdown-arrow"></div><div class="t-tr-dropdown-h">Original:</div><div class="t-tr-dropdown-orig">const-volatility</div><div class="t-tr-dropdown-notes">The text has been machine-translated via [http://translate.google.com Google Translate].<br/> You can help to correct and verify the translation. Click [http://en.cppreference.com/w/Cppreference:MachineTranslations here] for instructions.</div></div></div></div></div>) specifiers

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C++
 
Linguagem C++
Tópicos gerais
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General topics
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Controle de fluxo
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Flow control
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Declarações execução condicional
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Conditional execution statements
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Instruções de iteração
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Iteration statements
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Ir declarações
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Jump statements
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Funções
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Functions
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declaração da função
lambda declaração da função
modelo de função
linha especificador
especificações de exceção (obsoleta)
noexcept especificador (C++11)
Exceções
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Exceptions
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Namespaces
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Namespaces
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Tipos
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Types
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decltype specifier (C++11)
Especificadores
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Specifiers
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cv especificadores
armazenamento duração especificadores
constexpr especificador (C++11)
auto especificador (C++11)
alignas especificador (C++11)
Inicialização
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Initialization
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Literais
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Literals
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Expressões
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Expressions
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representações alternativas
Utilitários
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Utilities
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Tipos
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Types
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typedef declaration
tipo de alias declaração (C++11)
atributos (C++11)
Conversões
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Casts
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conversões implícitas
const_cast conversion
static_cast conversion
dynamic_cast conversion
reinterpret_cast conversion
Elenco C-estilo e funcional
Alocação de memória
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Memory allocation
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Classes
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Classes
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Classe propriedades específicas de função
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Class-specific function properties
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Funções membro especiais
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Special member functions
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Modelos
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Templates
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modelo de classe
modelo de função
especialização de modelo
pacotes de parâmetros (C++11)
Diversos
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Miscellaneous
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Assembly embutido
 
  • const - define que o tipo é constante'.
    Original:
    const - defines that the type is constant.
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  • volatile - define que o tipo é volátil'.
    Original:
    volatile - defines that the type is volatile.
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  • mutable - define que um membro de uma classe não afeta o estado externamente visível da classe. Membros mutable pode ser modificado em' classes de constantes, que é constness' é essencialmente ignorados para o membro particular.
    Original:
    mutable - defines that a member of a class does not affect the externally visible state of the class. mutable members can be modified in constant classes, that is constness is essentially ignored for the particular member.
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[editar] Explicação

Nota: CV-eliminatórias </ b> e <b> cv-especificadores </ b> (lista acima) não são os mesmos thing.
O CV-eliminatórias são propriedades de um tipo enquanto cv-especificadores são recurso de linguagem para definir CV-eliminatórias
Original:
Note: <b>cv-qualifiers</b> and <b>cv-specifiers</b> (list above) are not the same thing.
The cv-qualifiers are properties of a type whereas cv-specifiers are language feature to define cv-qualifiers
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</div>
Cv-eliminatórias definir duas propriedades básicas de um tipo: constness''' e volatilidade. A cv-qualificador pode ser um dos seguintes: 'const volatile', 'const', 'volatile' ou 'none'. const define que o tipo é constante, volatile define que o tipo é' volátil. Tipo não-constante e não-volátil não tem restrições adicionais, enquanto constante e volátil implica o seguinte:
Original:
Cv-qualifiers define two basic properties of a type: constness and volatility. A cv-qualifer can be one of the following: 'const volatile', 'const', 'volatile' or 'none'. const defines that a type is constant, volatile defines that the type is volatile. Non-constant and non-volatile type has no additional restrictions, whereas constant and volatile imply the following:
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  • ' 'Constante - o objeto não deve ser modificado. Tente fazer isso resulta em comportamento indefinido. Na maioria dos compiladores é tempo de compilação erro.
    Original:
    constant - the object shall not be modified. Attempt to do so results in undefined behavior. On most compilers it is compile-time error.
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  • ' 'Volátil - o objeto pode ser modificado por meio não detectáveis ​​pelo compilador e, portanto, algumas otimizações do compilador deve ser desativado.
    Original:
    volatile - the object can be modified by means not detectable by the compiler and thus some compiler optimizations must be disabled.
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Há ordenação parcial de CV-eliminatórias pela ordem de restrições crescentes. O tipo pode ser dito mais ou' cv menos qualificado, então:
Original:
There is partial ordering of cv-qualifiers by the order of increasing restrictions. The type can be said more or less cv-qualified then:
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  • Incompetente <const
    Original:
    unqualified < const
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  • Incompetente <volatile
    Original:
    unqualified < volatile
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  • Incompetente <const volatile
    Original:
    unqualified < const volatile
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  • const < const volatile
  • volatile < const volatile
Qualquer CV-eliminatórias são parte da definição do tipo, portanto, com diferentes tipos de CV-qualificações são sempre diferentes tipos. Portanto elenco é necessária para corresponder ao atribuir tipos de variáveis, funções de chamada, etc, só lançando a mais cv qualificado tipo é feito automaticamente como parte de <div class="t-tr-text"> conversões implícitas
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implicit conversions
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. Em particular, as seguintes conversões são permitidos:
Original:
Any cv-qualifiers are part of the type definition, hence types with different cv-qualifications are always different types. Therefore casting is needed to match types when assigning variables, calling functions, etc. Only casting to more cv-qualified type is done automatically as part of
conversões implícitas
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implicit conversions
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</div>. In particular, the following conversions are allowed:
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  • ' Tipo não qualificado pode ser convertido para const
    Original:
    unqualified type can be converted to const
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  • ' Tipo não qualificado pode ser convertido para volatile
    Original:
    unqualified type can be converted to volatile
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  • ' Tipo não qualificado pode ser convertido para const volatile
    Original:
    unqualified type can be converted to const volatile
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  • const tipo pode ser convertida para const volatile
    Original:
    const type can be converted to const volatile
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  • volatile tipo pode ser convertida para const volatile
    Original:
    volatile type can be converted to const volatile
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Para converter para um menos cv qualificado, tipo const_cast deve ser utilizado.
Original:
To convert to a less cv-qualified type, const_cast must be used.
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[editar] Palavras-chave

const, volatile, mutable

[editar] Exemplo

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