const-volatilità<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-volatilità<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-volatilità<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++
     
    Linguaggio C + +
    Temi generali
    Original:
    General topics
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    Controllo del flusso
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    Flow control
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    Dichiarazioni esecuzione condizionale
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    Conditional execution statements
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    Iterazione dichiarazioni
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    Iteration statements
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    Vai dichiarazioni
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    Jump statements
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    Funzioni
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    Functions
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    dichiarazione di funzione
    lambda funzione dichiarazione
    funzione di modello
    specificatore inline
    eccezioni specifiche (deprecato)
    noexcept specificatore (C++11)
    Eccezioni
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    Exceptions
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    Spazi dei nomi
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    Namespaces
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    Tipi
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    Types
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    decltype specifier (C++11)
    Specifiers
    Original:
    Specifiers
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    cv specificatori
    Durata di stoccaggio specificatori
    constexpr specificatore (C++11)
    specificatore auto (C++11)
    alignas specificatore (C++11)
    Inizializzazione
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    Initialization
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    Letterali
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    Literals
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    Espressioni
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    Expressions
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    rappresentazioni alternative
    Utilities
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    Utilities
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    Tipi
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    Types
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    typedef declaration
    Tipo alias dichiarazione (C++11)
    attributi (C++11)
    Lancia
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    Casts
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    conversioni implicite
    const_cast conversion
    static_cast conversion
    dynamic_cast conversion
    reinterpret_cast conversion
    Fusione C-stile e funzionale
    Occupazione della memoria
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    Memory allocation
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    Classi
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    Classes
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    Specifiche per una classe di funzioni proprietà
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    Class-specific function properties
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    esplicito (C++11)
    statico
    Funzioni membro speciali
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    Special member functions
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    Modelli
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    Templates
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    classe template
    funzione di modello
    modello di specializzazione
    parametri confezioni (C++11)
    Varie
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    Miscellaneous
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    Montaggio in linea
     
    • const - definisce che il tipo è costante.
      Original:
      const - defines that the type is constant.
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    • volatile - definisce che il tipo è volatili.
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      volatile - defines that the type is volatile.
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    • mutable - definisce che un membro di una classe non influisce sullo stato visibile all'esterno della classe. mutable membri possono essere modificati in classi' costante, che è constness' è essenzialmente ignorato per il membro particolare.
      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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    Spiegazione

    Nota: cv-qualificazioni </ b> e cv-specificatori di </ b> (elenco) non sono la stessa cosa thing.
    il CV-qualificazioni sono proprietà di un tipo, mentre cv-specificatori sono funzionalità del linguaggio per definire cv-qualificazione
    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-qualificazioni definire due proprietà di base di un tipo: constness''' e la volatilità. Un cv-qualifer può essere uno dei seguenti: 'const volatile', 'const', 'volatile' o 'none'. const definisce che un tipo è costante, volatile definisce che il tipo è' volatile. Tipo non costante e non volatile non ha limitazioni aggiuntive, mentre costante e volatile implica quanto segue:
    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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    • ' 'Costante - l'oggetto non deve essere modificata. Tentativo di farlo si traduce in un comportamento indefinito. Sulla maggior parte dei compilatori è errore di compilazione.
      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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    • ' 'Volatili - l'oggetto può essere modificato con mezzi non rilevabili dal compilatore, e quindi alcune ottimizzazioni del compilatore deve essere disabilitato.
      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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    C'è ordinamento parziale di cv-qualificazione per ordine di crescenti restrizioni. Il tipo può essere detto più o meno cv-qualificato allora:
    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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    • Qualificato <const
      Original:
      unqualified < const
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    • Qualificato <volatile
      Original:
      unqualified < volatile
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    • Qualificato <const volatile
      Original:
      unqualified < const volatile
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    • const < const volatile
    • volatile < const volatile
    Qualsiasi cv-qualificazione fanno parte della definizione del tipo, quindi con diversi tipi di cv-qualifiche sono sempre diversi tipi. Pertanto fusione è necessaria per abbinare i tipi quando si assegnano le variabili, le funzioni di chiamata, ecc Solo casting per più cv qualificati tipo viene eseguita automaticamente come parte del
    conversioni implicite
    Original:
    implicit conversions
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    . In particolare, le conversioni sono consentiti i seguenti:
    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
    conversioni implicite
    Original:
    implicit conversions
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    . In particular, the following conversions are allowed:
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    • Tipo qualificato può essere convertito const
      Original:
      unqualified type can be converted to const
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    • Tipo qualificato può essere convertito volatile
      Original:
      unqualified type can be converted to volatile
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    • Tipo qualificato può essere convertito const volatile
      Original:
      unqualified type can be converted to const volatile
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    • const tipo può essere convertito const volatile
      Original:
      const type can be converted to const volatile
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    • volatile tipo può essere convertito const volatile
      Original:
      volatile type can be converted to const volatile
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    Per convertire in un meno cv qualificati tipo, const_cast deve essere utilizzato.
    Original:
    To convert to a less cv-qualified type, const_cast must be used.
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    Parole chiave

    const, volatile, mutable

    Esempio

    This section is incomplete