std::regex_traits - cppreference.com
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      std::regex_traits

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      Biblioteca de expressões regulares
      Classes
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      Algoritmos
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      Algorithms
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      Iteradores
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      Iterators
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      Exceções
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      Características
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      Traits
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      Constantes
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      std::regex_traits
       
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      Definido no cabeçalho <regex>
      template< class CharT > class regex_traits;
      		 (desde C++11)
      O modelo de tipo traço regex_traits suprimentos std::basic_regex com o conjunto de tipos e funções necessárias para operar sobre o tipo CharT.
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      The type trait template regex_traits supplies std::basic_regex with the set of types and functions necessary to operate on the type CharT.
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      Uma vez que muitas das operações de regex são sensíveis à localidade (quando a bandeira std::regex_constants::collate está definido), a classe regex_traits normalmente tem uma instância de uma std::locale como um membro particular.
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      Since many of regex operations are locale-sensitive (when std::regex_constants::collate flag is set), the regex_traits class typically holds an instance of a std::locale as a private member.
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      Especializações padrão

      Duas especializações do std::regex_traits são definidos pela biblioteca padrão:
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      Two specializations of std::regex_traits are defined by the standard library:
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      std::regex_traits<char>
      std::regex_traits<wchar_t>
      Essas especializações tornar possível a utilização de std::basic_regex<char> (aka std::regex) e std::basic_regex<wchar_t> (aka std::wregex), mas, a fim de usar, por exemplo, std::basic_regex<char32_t>, fornecidos pelo utilizador std::regex_traits<char32_t> specializtion precisa de ser definida.
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      These specializations make it possible to use std::basic_regex<char> (aka std::regex) and std::basic_regex<wchar_t> (aka std::wregex), but in order to use, for example, std::basic_regex<char32_t>, user-provided specializtion std::regex_traits<char32_t> needs to be defined.
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      Tipos de membro

      Tipo
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      Type
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      		 Definition
      char_type CharT
      string_type std::basic_string<CharT>
      locale_type
      O local utilizado para o comportamento localizada na expressão regular. Deve ser CopyConstructible
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      The locale used for localized behavior in the regular expression. Must be CopyConstructible
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      char_class_type
      Representa uma classificação de caracteres e é capaz de manter um conjunto de implementação específica retornado por lookup_classname. Deve ser um BitmaskType .
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      Represents a character classification and is capable of holding an implementation specific set returned by lookup_classname. Must be a BitmaskType.
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      Funções de membro