<div class="t-tr-text">Concepts C + +:<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">C++ concepts:</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> BitmaskType
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Définit un type qui peut être utilisé pour représenter un ensemble de valeurs constantes ou toute combinaison de ces valeurs. Ce trait est généralement mis en œuvre par les types entiers, std::bitset ou énumérations (portée et sans portée) avec les surcharges d'opérateur supplémentaires .
Original:
Defines a type that can be used to represent a set of constant values or any combination of those values. This trait is typically implemented by integer types, std::bitset, or enumerations (scoped and unscoped) with additional operator overloads.
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[modifier] Exigences
Le type de masque de bits prend en charge un nombre fini d'éléments de masque de bits, qui sont des valeurs distinctes du type masque, de telle sorte que, pour chaque paire Ci et Cj, et Ci & Ci != 0 Ci & Cj == 0 .
Original:
The bitmask type supports a finite number of bitmask elements, which are distinct values of the bitmask type, such that, for any pair Ci and Cj, Ci & Ci != 0 and Ci & Cj == 0.
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Les opérateurs binaires operator&, operator|, operator^, operator~, operator&=, operator|= et operator^= sont définies pour les valeurs de type masque et ont la même sémantique que les correspondants intégrés dans des opérateurs sur les entiers non signés aurait si les éléments de bitmask étaient au nombre entier distinct puissances de deux .
Original:
The bitwise operators operator&, operator|, operator^, operator~, operator&=, operator|=, and operator^= are defined for values of the bitmask type and have the same semantics as the corresponding built-in operators on unsigned integers would have if the bitmask elements were the distinct integer powers of two.
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Les expressions suivantes sont bien formés et ont la signification suivante pour tout X. BitsetType
Original:
The following expressions are well-formed and have the following meaning for any BitsetType X
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| X |= Y | définit la valeur Y dans le
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| X &= ~Y | objet X.. efface la valeur Y dans le
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| X&Y != 0 | objet X..
indique que la valeur Y est défini dans le X. objet
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Chaque élément de masque de bits representible est définie comme une valeur constexpr du type masque de bits .
Original:
Each representible bitmask element is defined as a constexpr value of the bitmask type.
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[modifier] D'utilisation
Les types suivants de la bibliothèque standard satisfaire
BitmaskType:Original:
The following standard library types satisfy
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- std::ctype_base::mask
- std::ios_base::fmtflags
- std::ios_base::iostate
- std::ios_base::openmode
- std::regex_traits::char_class_type
- std::regex_constants::syntax_option_type
- std::regex_constants::match_flag_type
- std::launch,
Le code qui repose sur une certaine option de mise en œuvre particulier (par exemple int n = std::ios_base::hex), est non portable parce std::ios_base::fmtflags n'est pas nécessairement implicitement convertible en int .
Original:
Code that relies on some particular implementation option (e.g. int n = std::ios_base::hex), is nonportable because std::ios_base::fmtflags is not necessarily implicitly convertible to int.
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