std::regex_traits::isctype
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bool isctype( CharT c, char_class_type f )const; | ||
Determina se a
c personagem pertence à classe de caracteres identificados pelo f, o qual, por sua vez, é um valor retornado por lookup_classname().Original:
Determines whether the character
c belongs to the character class identified by f, which, in turn, is a value returned by lookup_classname().The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
A versão desta função fornecida nas especializações de biblioteca padrão de std::regex_traits, primeiro converte
f a alguns m valor temporário de std::ctype_base::mask tipo de aplicação definida maneira, em seguida, tenta classificar o personagem na localidade imbuído chamando std::use_facet<std::ctype<CharT>>(getloc()).is(m, c). Se isso voltou true, true é devolvido pelo isctype(). Caso contrário, verifica se c igual '_' eo f bitmask corresponde ao [:w:] classe de personagem, em que true caso é devolvido. Caso contrário, é retornado false.Original:
The version of this function provided in the standard library specializations of std::regex_traits, first converts
f to some temporary value m of type std::ctype_base::mask in implementation-defined manner, then attempts to classify the character in the imbued locale by calling std::use_facet<std::ctype<CharT>>(getloc()).is(m, c). If that returned true, true is returned by isctype(). Otherwise, checks whether c equals '_' and the bitmask f corresponds to the character class [:w:], in which case true is returned. Otherwise, false is returned.The text has been machine-translated via Google Translate.
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Nota: a norma publicada é colocada incorretamente, exigindo esta função retornar verdadeiro para
'_' em todos os casos. Este é LWG issue 2018.Original:
Note: the published standard is phrased incorrectly, requiring this function to return true for
'_' in all cases. This is LWG issue 2018.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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Índice |
[editar]Parâmetros
| c | - | o caráter de classificar Original: the character to classify The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| f | - | a máscara de bits obtido lookup_classname () Original: the bitmask obtained from lookup_classname() The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
[editar]Valor de retorno
true se
c é classificado por f, false outra forma.Original:
true if
c is classified by f, false otherwise.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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[editar]Exemplo
#include <iostream>#include <string>#include <regex> int main(){std::regex_traits<char> t;std::string str_alnum ="alnum";auto a = t.lookup_classname(str_alnum.begin(), str_alnum.end());std::string str_w ="w";// [:w:] is [:alnum:] plus '_'auto w = t.lookup_classname(str_w.begin(), str_w.end());std::cout<<std::boolalpha<< t.isctype('A', w)<<' '<< t.isctype('A', a)<<'\n'<< t.isctype('_', w)<<' '<< t.isctype('_', a)<<'\n'<< t.isctype(' ', w)<<' '<< t.isctype(' ', a)<<'\n';}
Saída:
true true true false false false
[editar]Veja também
recebe uma classe de personagem pelo nome Original: gets a character class by name 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) | |
[virtual] | classifica um personagem ou uma sequência de caracteres Original: classifies a character or a character sequence The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (virtual protegido of std::ctype função de membro) |
