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 - cppreference.com">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 - cppreference.com">
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      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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      <metanoindex/>

       
      C++
       
      Linguagem C++
      Tópicos gerais
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      General topics
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      Controle de fluxo
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      declaração da função
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      decltype specifier (C++11)
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      cv especificadores
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      Assembly embutido
       
      • const - define que o tipo é constante'.
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        const - defines that the type is constant.
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      • volatile - define que o tipo é volátil'.
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        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.
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      Explicação

      Nota: CV-eliminatórias </ b> e 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: cv-qualifiers and cv-specifiers (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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      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.
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        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
      conversões implícitas
      Original:
      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
      Original:
      implicit conversions
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      . In particular, the following conversions are allowed:
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      • ' Tipo não qualificado pode ser convertido para const
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        unqualified type can be converted to const
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      • ' Tipo não qualificado pode ser convertido para volatile
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        unqualified type can be converted to volatile
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      • ' Tipo não qualificado pode ser convertido para const volatile
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        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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      Palavras-chave

      const, volatile, mutable

      Exemplo

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