const-Volatilität<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" /> cv (<div class="t-tr-text">const-Volatilität<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-Volatilität<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++
 
Sprache C++
Allgemeine Themen
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General topics
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Flusskontrolle
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Flow control
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Bedingte Ausführung Aussagen
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Conditional execution statements
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Iterationsanweisungen
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Iteration statements
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Gehe Aussagen
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Jump statements
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Funktionen
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Functions
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Funktion Erklärung
Lambda-Funktion Erklärung
Funktions-Template
inline-Spezifizierer
Exception-Spezifikationen (veraltet)
noexcept Spezifizierer (C++11)
Ausnahmen
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Exceptions
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Namespaces
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Namespaces
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Types
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Types
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decltype specifier (C++11)
Specifiers
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Specifiers
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cv Planer
Lagerdauer Planer
constexpr Spezifizierer (C++11)
auto Spezifizierer (C++11)
alignas Spezifizierer (C++11)
Initialisierung
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Initialization
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Literale
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Literals
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Expressions
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Expressions
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alternative Darstellungen
Utilities
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Utilities
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Types
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Types
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typedef declaration
Typ Aliasdeklaration (C++11)
Attribute (C++11)
Wirft
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Casts
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impliziten Konvertierungen
const_cast conversion
static_cast conversion
dynamic_cast conversion
reinterpret_cast conversion
C-Stil und funktionale Besetzung
Speicherzuweisung
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Memory allocation
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Classes
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Classes
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Class-spezifische Funktion Eigenschaften
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Class-specific function properties
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explizit (C++11)
statisch
Besondere Member-Funktionen
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Special member functions
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Templates
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Templates
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Klassen-Template
Funktions-Template
Template-Spezialisierung
Parameter Packs (C++11)
Verschiedenes
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Miscellaneous
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Inline Montage
 
  • const - legt fest, dass der Typ konstant ist.
    Original:
    const - defines that the type is constant.
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  • volatile - legt fest, dass der Typ flüchtig ist.
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    volatile - defines that the type is volatile.
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  • mutable - legt fest, dass ein Mitglied einer Klasse keinen Einfluss auf den äußerlich sichtbaren Zustand der Klasse hat. mutable Mitglieder können in konstanten Klassen modifiziert werden, sodass die Konstantheit im Wesentlichen für das jeweilige Mitglied ignoriert wird.
    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 its constness is essentially ignored for the particular member.
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[Bearbeiten] Erklärung

Hinweis: cv-qualifier und cv-specifier (siehe Liste oben) sind nicht das Gleiche.
Die cv-qualifier sind Eigenschaften eines Typs während cv-specifier Sprach-Funktionen sind um cv-qualifier zu definieren
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-qualifier definieren zwei grundlegende Eigenschaften eines Typs: Konstantheit und Flüchtigkeit. Ein cv-qualifier kann eine der folgenden sein: 'const volatile', 'const', 'volatile' oder 'none'. const legt fest, dass der Typ konstant ist, volatile legt fest, dass der Typ flüchtig ist. Der nichtkonstante und nichtflüchtige Typ hat keine weiteren Beschränkungen, während konstant und flüchtig folgendes bedeuten :
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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  • konstant - das Objekt darf nicht verändert werden. Falls dies versucht wird folgt ein unbestimmtes Verhalten. Bei den meisten Compilern ist dies ein Kompilierungsfehler.
    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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  • flüchtig - das Objekt kann durch nicht nachweisbar durch den Compiler geändert werden und somit einige Compiler-Optimierungen deaktiviert werden .
    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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Es gibt eine partielle Ordnung der cv-qualifer durch die Reihenfolge der zunehmenden Einschränkungen. Der Typ kann so als mehr oder weniger cv-qualifiziert beschrieben werden:
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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  • uneingeschränkt < const
    Original:
    unqualified < const
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  • uneingeschränkt < volatile
    Original:
    unqualified < volatile
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  • uneingeschränkt < const volatile
    Original:
    unqualified < const volatile
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  • const < const volatile
  • volatile < const volatile
Alle cv-qualifier sind Teil der Typ-Definition, daher sind Typen mit unterschiedlichen cv-Qualifikationen auch immer verschiedene Typen. Deshalb ist Casting erforderlich, um Typen bei Variablenzuweisung, Funktionenaufruf usw. anzupassen. Nur Casting nach mehr cv qualifizierten wird automatisch als Teil der <div class="t-tr-text"> impliziten Konvertierungen
Original:
implicit conversions
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getan. Insbesondere werden die folgenden Konvertierungen erlaubt:
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
impliziten Konvertierungen
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implicit conversions
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</div>. In particular, the following conversions are allowed:
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  • uneingeschränkter Typ kann const umgewandelt werden
    Original:
    unqualified type can be converted to const
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  • uneingeschränkter Typ kann volatile umgewandelt werden
    Original:
    unqualified type can be converted to volatile
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  • uneingeschränkter Typ kann const volatile umgewandelt werden
    Original:
    unqualified type can be converted to const volatile
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  • const Typ kann in const volatile umgewandelt werden
    Original:
    const type can be converted to const volatile
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  • volatile Typ kann in const volatile umgewandelt werden
    Original:
    volatile type can be converted to const volatile
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Um in einen weniger cv qualifizierten Typ zu konvertieren, muss const_cast verwendet werden .
Original:
To convert to a less cv-qualified type, const_cast must be used.
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[Bearbeiten] Keywords

const, volatile, mutable

[Bearbeiten] Beispiel

This section is incomplete
Von „https://de.cppreference.com/mwiki/index.php?title=cpp/language/cv&oldid=31742“