Qualificatifs const et volatile
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const- définit que le type est constant .volatile- définit que le type est volatil .mutable- définit qu'un membre d'une classe n'affecte pas l'état visible de l'extérieur de la classe. Les membresmutablepeuvent être modifiés dans les classes constantes, cette propriété est en effet ignorée pour les membres mutable.
[modifier] Explication
- Remarque:cv-qualificatifs et cv-prescripteurs (liste ci-dessus) ne sont pas les mêmes thing.
la CV-qualification sont propriétés d'un type alors que cv-prescripteurs sont fonction de la langue de définir cv-qualificationsOriginal: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-qualifiersThe text has been machine-translated via Google Translate.
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Cv qualificatifs définir deux propriétés de base d'un type: constness''' et de la volatilité. Un CV-Qualifier peut être l'un des suivants:
'const volatile', 'const', 'volatile' ou 'none'. const définit qu'un type est'' constant, volatile définit que le type est' volatile. Type non-constante et non volatile n'a pas de restrictions supplémentaires, tandis que constante et volatile signifie ce qui suit: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:The text has been machine-translated via Google Translate.
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- ' Constant' - l'objet ne doit pas être modifié. Essayer de le faire entraîne un comportement indéfini. Sur la plupart des compilateurs, il est temps de compilation erreur .Original:constant - the object shall not be modified. Attempt to do so results in undefined behavior. On most compilers it is compile-time error.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions. - ' Volatile »- l'objet peut être modifié par des moyens non détectables par le compilateur et donc quelques optimisations du compilateur doit être désactivé .Original:volatile - the object can be modified by means not detectable by the compiler and thus some compiler optimizations must be disabled.The text has been machine-translated via Google Translate.
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Il est d'ordre partiel de cv-qualifiés par l'ordre des restrictions croissantes. Le type peut dire plus ou moins cv-qualifié alors:
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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- Sans réserve <
constOriginal:unqualified <constThe text has been machine-translated via Google Translate.
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volatileOriginal:unqualified <volatileThe text has been machine-translated via Google Translate.
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const volatileOriginal:unqualified <const volatileThe text has been machine-translated via Google Translate.
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const<const volatile -
volatile<const volatile
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Toute cv-qualifications font partie de la définition de type, donc avec différents types cv-qualifications sont toujours différents types. Par conséquent coulée est nécessaire pour correspondre à des types lors de l'affectation des variables, des fonctions d'appel, etc Seulement coulée à plus cv-qualifié type se fait automatiquement dans le cadre de <div class="t-tr-text"> les conversions implicites
. En particulier, les conversions suivantes sont autorisées:Original:
implicit conversions
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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
les conversions implicites</div>. In particular, the following conversions are allowed:
Original:
implicit conversions
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- ' Type non qualifié peut être converti en
constOriginal:unqualified type can be converted toconstThe text has been machine-translated via Google Translate.
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volatileOriginal:unqualified type can be converted tovolatileThe text has been machine-translated via Google Translate.
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const volatileOriginal:unqualified type can be converted toconst volatileThe text has been machine-translated via Google Translate.
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constpeut être converti enconst volatileOriginal:consttype can be converted toconst volatileThe text has been machine-translated via Google Translate.
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volatilepeut être converti enconst volatileOriginal:volatiletype can be converted toconst volatileThe text has been machine-translated via Google Translate.
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-
Pour convertir un moins cv-qualifié type, const_cast doit être utilisé .
Original:
To convert to a less cv-qualified type, const_cast must be used.
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[modifier] Mots-clés
[modifier] Exemple
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