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std::regex_traits::isctype

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< cpp‎ | regex‎ | regex traits

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C++
 
Espressioni regolari libreria
Classi
Original:
Classes
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basic_regex(C++11)
sub_match(C++11)
match_results(C++11)
Algoritmi
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Algorithms
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regex_match(C++11)
regex_search(C++11)
regex_replace(C++11)
Iteratori
Original:
Iterators
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regex_iterator(C++11)
regex_token_iterator(C++11)
Eccezioni
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Exceptions
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regex_error(C++11)
Tratti
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Traits
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regex_traits(C++11)
Costanti
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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
 
bool isctype( CharT c, char_class_type f ) const;
Determina se il carattere c appartiene alla classe di caratteri identificato da f, che, a sua volta, è un valore restituito da 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 versione di questa funzione disponibile nelle specializzazioni della libreria standard di std::regex_traits, prima converte f ad alcuni m valore temporaneo di tipo std::ctype_base::mask in attuazione definito modo, quindi tenta di classificare il personaggio nel locale impregnato chiamando std::use_facet<std::ctype<CharT>>(getloc()).is(m, c). Se questo ritorno true, true viene restituito da isctype(). Altrimenti, controlla se c uguale '_' e f maschera di bit corrispondente al [:w:] classe di caratteri, in cui viene restituito true caso. In caso contrario, viene restituito 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.
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Nota: la norma è formulata in modo errato pubblicato, che richiedono questa funzione per restituire true per '_' in tutti i casi. Questo è 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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Indice

[modifica] Parametri

c -
il carattere da classificare
Original:
the character to classify
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f -
la maschera di bit ottenuta da lookup_classname ()
Original:
the bitmask obtained from lookup_classname()
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[modifica] Valore di ritorno

true se c è classificato da f, false altrimenti.
Original:
true if c is classified by f, false otherwise.
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[modifica] Esempio

#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';
}

Output: 

true true
true false
false false

[modifica] Vedi anche
ottiene una classe di caratteri per nome
Original:
gets a character class by name
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(metodo pubblico)
[virtuale]
classifica un carattere o una sequenza di caratteri
Original:
classifies a character or a character sequence
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(virtuale protetto funzione of std::ctype membro) [modifica]
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