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std::regex_traits::lookup_classname

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< cpp‎ | regex‎ | regex traits

 
 
Biblioteca de expressões regulares
Classes
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Classes
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basic_regex(C++11)
sub_match(C++11)
match_results(C++11)
Algoritmos
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Algorithms
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regex_match(C++11)
regex_search(C++11)
regex_replace(C++11)
Iteradores
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Iterators
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regex_iterator(C++11)
regex_token_iterator(C++11)
Exceções
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Exceptions
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regex_error(C++11)
Características
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Traits
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regex_traits(C++11)
Constantes
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Constants
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syntax_option_type(C++11)
match_flag_type(C++11)
error_type(C++11)
 
std::regex_traits
Funções de membro
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Member Functions
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regex_traits::regex_traits
regex_traits::length
regex_traits::translate
regex_traits::translate_nocase
regex_traits::transform
regex_traits::transform_primary
regex_traits::lookup_collatename
regex_traits::lookup_classname
regex_traits::isctype
regex_traits::value
regex_traits::imbue
regex_traits::getloc
 
template< class ForwardIt >

char_class_type lookup_classname( ForwardIt first,
                                  ForwardIt last,

                                  bool icase = false ) const;
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.
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Se o parâmetro é icase true, 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.
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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
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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
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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.
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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
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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
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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

[editar] Veja também

Indica a participação em uma classe de personagem
Original:
indicates membership in a character class
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(função pública membro)