std::regex_traits::lookup_classname
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template<class ForwardIt > char_class_type lookup_classname( ForwardIt first, | ||
Wenn die Zeichenfolge
[first, last) steht für den Namen eines gültigen Charakter-Klasse in der Zeit durchdrungen locale (das heißt, die Zeichenfolge zwischen [: und :] in POSIX reguläre Ausdrücke), gibt die Implementierung definiert Wert, der diesen Charakter-Klasse. Andernfalls gibt Null .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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Wenn der Parameter
icase ist true, ignoriert die Charakter-Klasse und Kleinschreibung, zB die Regex [:lower:] mit std::regex_constants::icase generiert einen Aufruf regex_traits<>::lookup_classname() mit [first, last) Angabe der String "lower" und icase ==true. Dieser Aufruf gibt den gleichen Bitmaske wie der Ruf durch die regex [:alpha:] mit icase ==false generiert .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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Die folgenden Zeichenklassen werden immer erkannt, sowohl schmale und breite Charakter Formen, sowie die Klassifikationen zurückgegeben (mit icase ==false) entsprechen den passenden Klassifikationen durch die std::ctype Facette des durchdrungen Gebietsschema erhalten, wie folgt:
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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Charakter-Klasse 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 mit '_' optional hinzugefügt 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. |
Die Klassifizierung nach der Zeichenfolge "w" zurückgegeben werden genau das gleiche wie "alnum", in welchem Fall
isctype() fügt '_' explizit .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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Inhaltsverzeichnis |
[Bearbeiten]Parameter
| first, last | - | ein Paar von Iteratoren, die die Sequenz von Zeichen, die den Namen eines Charakters Klasse stellt bestimmt 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 | - | wenn das stimmt, ignoriert die Groß-/ Kleinschreibung unterschieden im Charakter Klassifizierung 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. | ||
[Bearbeiten]Rückgabewert
Die Bitmaske, der das Zeichen Klassifizierung durch die gegebene Zeichenklasse oder Null bestimmt werden, wenn die Klasse unbekannt ist .
Original:
The bitmask representing the character classification determined by the given character class, or zero if the class is unknown.
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[Bearbeiten]Beispiel
| This section is incomplete Reason: no example |
[Bearbeiten]Siehe auch
zeigt die Mitgliedschaft in einer Zeichenklasse 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. (öffentliche Elementfunktion) | |
