<div class="t-tr-text">C + +: conceitos<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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Define um tipo que pode ser usado para representar um conjunto de valores constantes ou qualquer combinação desses valores. Esta característica é normalmente implementada por tipos inteiros, std::bitset, ou enumerações (escopo e sem escopo) com sobrecargas de operador adicionais.
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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[editar] Requisitos
O tipo de máscara de bits suporta um número finito de elementos bitmask, que são valores distintos do tipo máscara de bits, de modo que, para qualquer par Ci e Cj, Ci & Ci != 0 e 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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Os operadores bit a bit operator&, operator|, operator^, operator~, operator&=, operator|=, e operator^= são definidas para valores do tipo de máscara de bits e têm a mesma semântica que os correspondentes operadores internos sobre inteiros sem sinal teria se os elementos foram bitmask o inteiro distinta potências de dois.
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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As seguintes expressões são bem formados e têm o seguinte significado em qualquer X. BitsetType
Original:
The following expressions are well-formed and have the following meaning for any BitsetType X
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| X |= Y | define o valor de Y no objeto
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| X &= ~Y | X.. limpa o valor Y no X. objeto
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| X&Y != 0 | Y indica que o valor é definido no objeto X
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Cada elemento de máscara de bits representible é definida como um valor do tipo constexpr bitmask.
Original:
Each representible bitmask element is defined as a constexpr value of the bitmask type.
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[editar] Uso
Os seguintes tipos de biblioteca padrão satisfazer
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,
O código que se baseia em algumas opção de implementação particular (por exemplo int n = std::ios_base::hex), é porque não portável std::ios_base::fmtflags não é necessariamente implicitamente conversível para 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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