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std::codecvt::in, std::codecvt::do_in

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< cpp‎ | locale‎ | codecvt

 
 
Biblioteca localizações
Localidades e facetas
Original:
Locales and facets
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locale
Classificação de caracteres
Original:
Character classification
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Conversões
Original:
Conversions
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Facet classes base da categoria
Original:
Facet category base classes
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Categorias faceta
Original:
Facet categories
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Específicos da localidade facetas
Original:
Locale-specific facets
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Facetas de conversão de código
Original:
Code conversion facets
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codecvt_utf8(C++11)
codecvt_utf16(C++11)
C localidade
Original:
C locale
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Defined in header <locale>
public:

result in( stateT& state,
           const externT* from,
           const externT* from_end,
           const externT*& from_next,
           internT* to,
           internT* to_end,

           internT*& to_next ) const;
(1)
protected:

result do_in( stateT& state,
              const externT* from,
              const externT* from_end,
              const externT*& from_next,
              internT* to,
              internT* to_end,

              internT*& to_next ) const;
(2)
1)
função de membro público, chama a do_in função de membro da classe derivada mais.
Original:
public member function, calls the member function do_in of the most derived class.
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2)
Se esta faceta codecvt define uma conversão, traduz os caracteres externos do [from, from_end) intervalo de origem a personagens internos, colocando os resultados nos locais posteriores a partir de to. Converte não mais do que from_end - from caracteres externos e não mais do que escreve to_end - to caracteres internos. Folhas from_next e to_next apontando um além do último elemento convertido com êxito.
Original:
If this codecvt facet defines a conversion, translates the external characters from the source range [from, from_end) to internal characters, placing the results in the subsequent locations starting at to. Converts no more than from_end - from external characters and writes no more than to_end - to internal characters. Leaves from_next and to_next pointing one beyond the last element successfully converted.
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Se esta faceta codecvt não define uma conversão, não são personagens convertidos. to_next é ajustado para ser igual a to, state permanece inalterado, e é retornado std::codecvt_base::noconv.
Original:
If this codecvt facet does not define a conversion, no characters are converted. to_next is set to be equal to to, state is unchanged, and std::codecvt_base::noconv is returned.
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Índice

[editar] Valor de retorno

Um valor de std::codecvt_base::result tipo, que indica o estado de sucesso da seguinte forma:
Original:
A value of type std::codecvt_base::result, indicating the success status as follows:
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ok
conversão completa
Original:
conversion completed
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partial
não há espaço suficiente no buffer de saída ou fim inesperado de buffer de origem
Original:
not enough space in the output buffer or unexpected end of source buffer
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error
encontrado um caractere que não pôde ser convertida
Original:
encountered a character that could not be converted
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noconv
esta faceta é não-conversão, sem saída escrito
Original:
this facet is non-converting, no output written
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A especialização não-conversão std::codecvt<char, char, std::mbstate_t> sempre retorna std::codecvt_base::noconv
Original:
The non-converting specialization std::codecvt<char, char, std::mbstate_t> always returns std::codecvt_base::noconv
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[editar] Notas

Requer que from <= from_end && to <= to_end e que state ou que representa o estado inicial ou de deslocamento obtida pela conversão dos caracteres precedentes na sequência.
Original:
Requires that from <= from_end && to <= to_end and that state either representing the initial shift state or obtained by converting the preceding characters in the sequence.
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O efeito sobre state é deliberadamente não especificado. Em facetas padrão, é usado para manter o estado mudam como ao chamar std::mbsrtowcs, e é, portanto, atualizado para refletir o estado de conversão depois que o personagem processada por último externa, mas uma faceta definido pelo usuário é livre para usá-lo para manter qualquer outro estado, por exemplo, contar o número de caracteres especiais encontradas.
Original:
The effect on state is deliberately unspecified. In standard facets, it is used to maintain shift state like when calling std::mbsrtowcs, and is therefore updated to reflect the conversion state after the last processed external character, but a user-defined facet is free to use it to maintain any other state, e.g. count the number of special characters encountered.
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[editar] Exemplo

#include <iostream>
#include <string>
#include <locale>
int main()
{
    std::locale::global(std::locale("en_US.utf8"));
    auto& f = std::use_facet<std::codecvt<wchar_t, char, std::mbstate_t>>(std::locale());
    std::string external = u8"z\u00df\u6c34\U0001d10b"; // or u8"zß水𝄋"
                          // or "\x7a\xc3\x9f\xe6\xb0\xb4\xf0\x9d\x84\x8b";
 
    // note that the following can be done with wstring_convert
    std::mbstate_t mb = std::mbstate_t(); // initial shift state
    std::wstring internal(external.size(), '\0'); 
    const char* from_next;
    wchar_t* to_next;
    f.in(mb, &external[0], &external[external.size()], from_next,
             &internal[0], &internal[internal.size()], to_next);
    // error checking skipped for brevity
    internal.resize(to_next - &internal[0]);
 
    std::wcout << L"The string in wide encoding: " << internal << '\n';
}

Output:

The string in wide encoding: zß水𝄋

[editar] Veja também

[virtual]
lê o arquivo associado
Original:
reads from the associated file
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(virtual protegido of std::basic_filebuf função de membro) [edit]
converte uma seqüência de bytes em uma seqüência de largura
Original:
converts a byte string into a wide string
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(of std::wstring_convert função pública membro) [edit]
converte uma cadeia de caracteres multibyte estreita para string de largura, determinado estado
Original:
converts a narrow multibyte character string to wide string, given state
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(função) [edit]
[virtual]
Converte uma cadeia de internt para externT, como ao escrever para o arquivo
Original:
converts a string from internT to externT, such as when writing to file
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(virtual protegido função de membro) [edit]