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      std::codecvt::always_noconv, std::codecvt::do_always_noconv

      De cppreference.com

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      <metanoindex/>

       
      C++
       
      Biblioteca localizações
      Localidades e facetas
      Original:
      Locales and facets
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      Classificação de caracteres
      Original:
      Character classification
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      Conversões
      Original:
      Conversions
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      Facet classes base da categoria
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      Facet category base classes
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      Categorias faceta
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      Facet categories
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      Específicos da localidade facetas
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      Locale-specific facets
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      Facetas de conversão de código
      Original:
      Code conversion facets
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      (C++11)
      (C++11)
      C localidade
      Original:
      C locale
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      std::codecvt
       
      <tbody> </tbody>
      Definido no cabeçalho <locale>
      public: bool always_noconv() const
      		 (1)
      protected: bool do_max_length() const
      		 (2)

      1)

      função de membro público, chama a do_always_noconv função de membro da classe derivada mais.
      Original:
      public member function, calls the member function do_always_noconv of the most derived class.
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      2)

      retornos. true se ambos do_in() e do_out() std::codecvt_base::noconv retorno para todas as entradas válidas.
      Original:
      returns true if both do_in() and do_out() return std::codecvt_base::noconv for all valid inputs.
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      Valor de retorno

      true se esta faceta conversão realiza nenhuma conversão, false outra forma.
      Original:
      true if this conversion facet performs no conversions, false otherwise.
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      A especialização não-conversão std::codecvt<char, char, std::mbstate_t> retornos true
      Original:
      The non-converting specialization std::codecvt<char, char, std::mbstate_t> returns true
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      Notas

      Esta função pode ser usada por exemplo na implementação de std::basic_filebuf::underflow usar cópia caráter granel em vez de chamar std::codecvt::in se é sabido que o local imbuída no std::basic_filebuf não executa quaisquer conversões.
      Original:
      This function may be used e.g. in the implementation of std::basic_filebuf::underflow to use bulk character copy instead of calling std::codecvt::in if it is known that the locale imbued in the std::basic_filebuf does not perform any conversions.
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      Exceções

      noexcept specification:  
      <tbody> </tbody>
      noexcept
        (desde C++11)

      Exemplo

      #include <locale>
#include <iostream>
int main()
{
    std::cout << "The non-converting char<->char codecvt::always_noconv() returns " 
              << std::boolalpha
              << std::use_facet<std::codecvt<char, char, std::mbstate_t>>(
                    std::locale()
                 ).always_noconv() << "\n"
              << "while wchar_t<->char codecvt::always_noconv() returns "
              << std::use_facet<std::codecvt<wchar_t, char, std::mbstate_t>>(
                    std::locale()
                 ).always_noconv() << "\n";

}

      Saída: 

      The non-converting char<->char codecvt::always_noconv() returns true
while wchar_t<->char codecvt::always_noconv() returns false