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std::regex_traits::transform_primary

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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 >
string_type transform_primary( ForwardIt first, ForwardIt last) const
Obtém a chave principal de classificação (caso ignorando, diacríticos, variante, etc) para a seqüência de caracteres [first, last), de tal forma que se uma chave principal de classificação compara a menos de uma outra chave principal de classificação com operator<, em seguida, a seqüência de caracteres que produziu a primeira chave de classificação vem antes a seqüência de caracteres que produziu a chave de classificação em segundo lugar, em ordem o local atualmente imbuído de agrupamento principal.
Original:
Obtains the primary (ignoring case, diacritics, variant, etc) sort key for the character sequence [first, last), such that if a primary sort key compares less than another primary sort key with operator<, then the character sequence that produced the first sort key comes before the character sequence that produced the second sort key, in the currently imbued locale's primary collation order.
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A biblioteca regex usa esta característica para combinar caracteres contra classes de equivalência. Por exemplo, o [[=a=]] regex é equivalente ao carácter c1 se traits.transform_primary(c1) é equivalente a traits.transform_primary("a") (o que é verdadeiro para qualquer c1 de "AÀÁÂÃÄÅaàáâãäå"). Note que transform_primary() usa um argumento de seqüência de caracteres, como as classes de equivalência pode ser multi-caractere, como [[=ll=]].
Original:
The regex library uses this trait to match characters against equivalence classes. For example, the regex [[=a=]] is equivalent to the character c1 if traits.transform_primary(c1) is equivalent to traits.transform_primary("a") (which is true for any c1 from "AÀÁÂÃÄÅaàáâãäå"). Note that transform_primary() takes a character sequence argument because equivalence classes may be multicharacter, such as [[=ll=]].
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Não há maneira portátil para definir chave de classificação principal em termos de std::locale vez que a conversão a partir da chave de agrupamento retornado por std::collate::transform() para a chave primária equivalência é específica para cada caso, e se o utilizador substitui o std::collate faceta, que a conversão não é mais conhecido por std::regex_traits a biblioteca norma. Especializações biblioteca padrão de std::regex_traits retornar uma string vazia, a menos que a faceta std::collate do local atualmente imbuído não foi substituída pelo usuário, e ainda corresponde fornecido pelo sistema faceta std::collate), em que std::collate_byname<charT>::transform(first, last) caso é executado ea chave tipo que produz é convertidos para a chave de classificação esperada primário utilizando uma conversão de localidade específica.
Original:
There is no portable way to define primary sort key in terms of std::locale since the conversion from the collation key returned by std::collate::transform() to the primary equivalence key is locale-specific, and if the user replaces the std::collate facet, that conversion is no longer known to the standard library's std::regex_traits. Standard library specializations of std::regex_traits return an empty string unless the std::collate facet of the currently-imbued locale was not replaced by the user, and still matches the system-supplied std::collate facet), in which case std::collate_byname<charT>::transform(first, last) is executed and the sort key it produces is converted to the expected primary sort key using a locale-specific conversion.
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[editar] Parâmetros

first, last -
um par de iteradores que determina a seqüência de caracteres para comparar
Original:
a pair of iterators which determines the sequence of characters to compare
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Type requirements
-
ForwardIt must meet the requirements of ForwardIterator.

[editar] Valor de retorno

A chave principal de classificação para a seqüência de caracteres [first, last) na localidade atualmente imbuído, caso ignorando, variante, diacríticos, etc
Original:
The primary sort key for the character sequence [first, last) in the currently imbued locale, ignoring case, variant, diacritics, etc.
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[editar] Exemplo

Demonstra o recurso regex que funciona através transform_primary ()
Original:
Demonstrates the regex feature that works through transform_primary()
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#include <iostream>
#include <regex>
 
int main()
{
    std::locale::global(std::locale("en_US.UTF-8"));
    std::wstring str = L"AÀÁÂÃÄÅaàáâãäå";
    std::wregex re(L"[[=a=]]*", std::regex::basic);
    std::cout << std::boolalpha << std::regex_match(str, re) << '\n';
}

Output:

true