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std::codecvt::encoding, std::codecvt::do_encoding

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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
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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 encoding() const
(1)
protected:
int do_encoding() const
(2)
1)
função de membro público, chama a do_encoding função de membro da classe derivada mais.
Original:
public member function, calls the member function do_encoding of the most derived class.
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2) if the encoding represented by this codecvt facet maps each internal character to the same, constant number of external characters, returns that number. If the encoding is variable-length (e.g. UTF-8 or UTF-16), returns 0. If the encoding is state-dependent, returns -1.

Índice

[editar] Valor de retorno

The exact number of externT characters that correspond to one internT character, if constant. 0 if the number varies, -1 if the encoding is state-dependent.

A especialização não-conversão std::codecvt<char, char, std::mbstate_t> retornos 1
Original:
The non-converting specialization std::codecvt<char, char, std::mbstate_t> returns 1
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[editar] Exceções

noexcept specification:  
noexcept
  (a partir do C++ 11)

[editar] Exemplo

#include <locale>
#include <iostream>
int main()
{
    std::cout << "en_US.utf8 is a variable-length encoding, encoding() returns "
              << std::use_facet<std::codecvt<wchar_t, char, std::mbstate_t>>(
                    std::locale("en_US.utf8")
              ).encoding() << '\n';
 
    std::cout << "zh_CN.gb18030 is also variable-length, encoding() == "
              << std::use_facet<std::codecvt<wchar_t, char, std::mbstate_t>>(
                    std::locale("zh_CN.gb18030")
              ).encoding() << '\n';
 
    std::cout << "ru_RU.koi8r is a single-byte encoding encoding() == "
              << std::use_facet<std::codecvt<wchar_t, char, std::mbstate_t>>(
                    std::locale("ru_RU.koi8r")
              ).encoding() << '\n';
}

Output:

en_US.utf8 is a variable-length encoding, encoding() returns 0
zh_CN.gb18030 is also variable-length, encoding() == 0
ru_RU.koi8r is a single-byte encoding encoding() == 1

[editar] Veja também

MB_CUR_MAX
número máximo de bytes em um caractere multibyte na atual C locale
(variável macro)
Original:
maximum number of bytes in a multibyte character in the current C locale
(variável macro)
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[edit]
devolve o número máximo de caracteres externT que poderia ser convertido em um único caractere internt
Original:
returns the maximum number of externT characters that could be converted into a single internT character
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(virtual protegido função de membro) [edit]