std::regex_traits::lookup_classname
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< cpp | regex | regex traits
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template<class ForwardIt > char_class_type lookup_classname( ForwardIt first, | ||
Si la secuencia de caracteres
[first, last) representa el nombre de una clase de caracteres válidos en el entorno local actualmente impregnado (es decir, la cadena entre [: y :] en expresiones regulares POSIX), devuelve el definido por la implantación valor que representa esta clase de caracteres. De lo contrario, devuelve cero .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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Si el parámetro es
icasetrue, la clase de caracteres ignora mayúsculas y minúsculas, por ejemplo, la expresión regular [:lower:] con std::regex_constants::icase genera una llamada a regex_traits<>::lookup_classname() con [first, last) indica la cadena "lower" y icase ==true. Esta llamada devuelve la máscara de bits igual a la llamada generado por la expresión regular [:alpha:] con 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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Las siguientes clases de caracteres son reconocidos, en formas tanto de carácter estrechos y anchos, y devolvió las clasificaciones (con icase ==false) corresponden a las clasificaciones obtenidas por el juego std::ctype faceta de la configuración regional imbuida de la siguiente manera:
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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carácter de clase 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 con '_' añade opcionalmente 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. |
La clasificación devuelve para el "w" cadena puede ser exactamente el mismo que "alnum", en el que
isctype() caso añade '_' explícitamente .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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Contenido |
[editar]Parámetros
| first, last | - | un par de iteradores que determina la secuencia de caracteres que representa el nombre de una clase 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 | - | si es cierto, ignora la parte superior / inferior distinción caso de la clasificación 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. |
| Requisitos de tipo | ||
-ForwardIt debe reunir los requerimientos de ForwardIterator. | ||
[editar]Valor de retorno
La máscara de bits que representa la clasificación de caracteres determinado por la clase de caracteres dado, o cero si la clase es desconocida .
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]Ejemplo
| Esta sección está incompleta Razón: sin ejemplo |
[editar]Ver también
indica la pertenencia a una clase de caracteres 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. (función miembro pública) |
