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std::regex_traits::isctype

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< cpp‎ | regex‎ | regex traits

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C++
 
Regular expressions bibliothèque
Classes
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Classes
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basic_regex (C++11)
sub_match (C++11)
match_results (C++11)
Algorithmes
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Algorithms
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regex_match (C++11)
regex_search (C++11)
regex_replace (C++11)
Les itérateurs
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Iterators
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regex_iterator (C++11)
regex_token_iterator (C++11)
Exceptions
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Exceptions
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regex_error (C++11)
Traits
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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)
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std::regex_traits
 
bool isctype( CharT c, char_class_type f ) const;
Détermine si le caractère c appartient à la classe de caractères identifiés par f, qui, à son tour, est une valeur renvoyée par 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().
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La version de cette fonction fournie dans les spécialités de la bibliothèque standard de std::regex_traits, convertit d'abord f une certaine m valeur temporaire de std::ctype_base::mask type défini par l'implémentation manière, tente alors de classer le caractère de la localisation en imprégnée en appelant std::use_facet<std::ctype<CharT>>(getloc()).is(m, c). Si ce retour true, true est retourné par isctype(). Sinon, vérifie si c égale '_' et le f masque correspond à la classe de caractères [:w:], dans lequel true affaire est renvoyée. Sinon, false est retourné .
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.
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Remarque: la norme publiée est formulée de manière incorrecte, nécessitant cette fonction pour retourner vrai pour '_' dans tous les cas. C'est 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.
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Sommaire

[modifier] Paramètres

c -
le caractère à classer
Original:
the character to classify
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f -
le masque obtenu à partir lookup_classname ()
Original:
the bitmask obtained from lookup_classname()
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[modifier] Retourne la valeur

true si c est classé par f, false autrement .
Original:
true if c is classified by f, false otherwise.
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[modifier] Exemple

#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';
}

Résultat : 

true true
true false
false false

[modifier] Voir aussi
obtient une classe de caractères par nom
Original:
gets a character class by name
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(fonction membre publique)
[
virtuel
Original:
virtual
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]
classer un caractère ou une séquence de caractères
Original:
classifies a character or a character sequence
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(fonction membre virtuelle protégée de std::ctype) [edit]
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