std::regex_traits::lookup_classname
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template<class ForwardIt > char_class_type lookup_classname( ForwardIt first, | ||
Se a seqüência de caracteres
[first, last) representa o nome de uma classe de caracteres válidos na localidade atualmente imbuído (isto é, a corda entre [: e :] em expressões regulares POSIX), retorna a implementação valor definido representando esta classe de personagem. Caso contrário, retorna zero.Original:
If the character sequence
[first, last) represents the name of a valid character class in the currently imbued locale (that is, the string between [: and :] in POSIX regular expressions), returns the implementation-defined value representing this character class. Otherwise, returns zero.The text has been machine-translated via Google Translate.
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Se o parâmetro é
icasetrue, a classe de personagem ignora maiúsculas e minúsculas, por exemplo, a regex [:lower:] com std::regex_constants::icase gera uma chamada para regex_traits<>::lookup_classname() com [first, last) indicando a seqüência "lower" e icase ==true. Essa chamada retorna a máscara de bits mesmo que a chamada gerado pelo regex [:alpha:] com icase ==false.Original:
If the parameter
icase is true, the character class ignores character case, e.g. the regex [:lower:] with std::regex_constants::icase generates a call to regex_traits<>::lookup_classname() with [first, last) indicating the string "lower" and icase ==true. This call returns the same bitmask as the call generated by the regex [:alpha:] with icase ==false.The text has been machine-translated via Google Translate.
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As classes de caracteres a seguir são sempre reconhecidos, em formas de caracteres tanto estreitas e largas, e as classificações devolvido (com icase ==false) correspondem às classificações correspondentes obtidos pelo std::ctype faceta da localidade impregnada, como se segue:
Original:
The following character classes are always recognized, in both narrow and wide character forms, and the classifications returned (with icase ==false) correspond to the matching classifications obtained by the std::ctype facet of the imbued locale, as follows:
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classe de personagem Original: character class The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. | std::ctype classification |
| "alnum" | std::ctype_base::alnum |
| "alpha" | std::ctype_base::alpha |
| "blank" | std::ctype_base::blank |
| "cntrl" | std::ctype_base::cntrl |
| "digit" | std::ctype_base::digit |
| "graph" | std::ctype_base::graph |
| "lower" | std::ctype_base::lower |
| "print" | std::ctype_base::print |
| "punct" | std::ctype_base::punct |
| "space" | std::ctype_base::space |
| "upper" | std::ctype_base::upper |
| "xdigit" | std::ctype_base::xdigit |
| "d" | std::ctype_base::digit |
| "s" | std::ctype_base::space |
| "w" | std::ctype_base::alnum por "_", opcionalmente, acrescentou Original: std::ctype_base::alnum with '_' optionally added The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
A classificação voltou para a cadeia "w" pode ser exatamente o mesmo que "alnum", em que
isctype() caso adiciona '_' explicitamente.Original:
The classification returned for the string "w" may be exactly the same as "alnum", in which case
isctype() adds '_' explicitly.The text has been machine-translated via Google Translate.
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Índice |
[editar]Parâmetros
| first, last | - | um par de iteradores que determina a seqüência de caracteres que representa o nome de uma classe de caracteres Original: a pair of iterators which determines the sequence of characters that represents a name of a character class The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| icase | - | se for verdade, ignora o superior / distinção em caixa baixa na classificação de caracteres Original: if true, ignores the upper/lower case distinction in the character classification The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| Type requirements | ||
-ForwardIt must meet the requirements of ForwardIterator. | ||
[editar]Valor de retorno
A máscara de bits que representa a classificação de caracteres determinado pela classe determinado personagem, ou zero se a classe é desconhecido.
Original:
The bitmask representing the character classification determined by the given character class, or zero if the class is unknown.
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[editar]Exemplo
| Esta seção está incompleta Motivo: sem exemplo |
[editar]Veja também
Indica a participação em uma classe de personagem Original: indicates membership in a character class The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) | |
