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std::codecvt::length, std::codecvt::do_length

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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
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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
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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:

int length( stateT& state,
            const externT* from,
            const externT* from_end,

            std::size_t max ) const
(1)
protected:

int do_length( stateT& state,
               const externT* from,
               const externT* from_end,

               std::size_t max ) const
(2)
1)
função de membro público, chama a do_length função de membro da classe derivada mais.
Original:
public member function, calls the member function do_length of the most derived class.
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2)
tentativas de converter os personagens externT da matriz de caracteres definidos pelo [from, from_end), dado state estado inicial de conversão, para a maioria dos max internT caracteres, e retorna o número de caracteres que a conversão externT tal consomem. Modifica state como se executando do_in(state, from, from_end, from, to, to+max, to) para algum buffer imaginário [to, to+max) saída.
Original:
attempts to convert the externT characters from the character array defined by [from, from_end), given initial conversion state state, to at most max internT characters, and returns the number of externT characters that such conversion would consume. Modifies state as if by executing do_in(state, from, from_end, from, to, to+max, to) for some imaginary [to, to+max) output buffer.
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[editar] Valor de retorno

O número de caracteres externT que seria consumido se convertido por do_in() até que todos os personagens from_end-from foram consumidos ou max internT personagens eram produtor, ou um erro de conversão ocorreu.
Original:
The number of externT characters that would be consumed if converted by do_in() until either all from_end-from characters were consumed or max internT characters were producer, or a conversion error occurred.
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A especialização não-conversão std::codecvt<char, char, std::mbstate_t> retornos std::min(max, from_end-from)
Original:
The non-converting specialization std::codecvt<char, char, std::mbstate_t> returns std::min(max, from_end-from)
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[editar] Exemplo

#include <locale>
#include <string>
#include <iostream>
int main()
{
    //  narrow multibyte encoding
    std::string s = "z\u00df\u6c34\U0001d10b"; // or u8"zß水𝄋"
                      // or "\x7a\xc3\x9f\xe6\xb0\xb4\xf0\x9d\x84\x8b";
    std::mbstate_t mb = std::mbstate_t();
    std::cout << "Only the first " <<
              std::use_facet<std::codecvt<wchar_t, char, std::mbstate_t>>(
                    std::locale("en_US.utf8")
              ).length(mb, &s[0], &s[s.size()], 2)
              << " bytes out of " << s.size() << " would be consumed "
                 " to produce the first 2 characters\n";
}

Output:

Only the first 3 bytes out of 10 would be consumed to produce the first 2 characters

[editar] Veja também

[virtual]
Converte uma cadeia de externT a Internt, como quando lendo de um arquivo
Original:
converts a string from externT to internT, such as when reading from file
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(virtual protegido função de membro) [edit]