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std::codecvt_byname

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< cpp‎ | locale

 
 
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>
template< class internT, class externT, class stateT >
class codecvt_byname : public std::codecvt<internT, externT, stateT>;
std::codecvt_byname é uma faceta std::codecvt que encapsula as regras de caracteres multibyte / largo de conversão de uma localidade especificada em sua construção.
Original:
std::codecvt_byname is a std::codecvt facet which encapsulates multibyte/wide character conversion rules of a locale specified at its construction.
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Quatro especializações são fornecidos pela biblioteca padrão
Original:
Four specializations are provided by the standard library
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Defined in header <locale>
std::codecvt_byname<char, char, std::mbstate_t>
conversão de identidade
Original:
identity conversion
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std::codecvt_byname<char16_t, char, std::mbstate_t>
conversão entre UTF-16 e UTF-8 (a partir do C++ 11)
Original:
conversion between UTF-16 and UTF-8 (a partir do C++ 11)
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std::codecvt_byname<char32_t, char, std::mbstate_t>
conversão entre UTF-32 e UTF-8 (a partir do C++ 11)
Original:
conversion between UTF-32 and UTF-8 (a partir do C++ 11)
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std::codecvt_byname<wchar_t, char, std::mbstate_t>
localidade específica conversão entre corda larga e estreita, possivelmente multibyte string,
Original:
locale-specific conversion between wide string and narrow, possibly multibyte, string
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Índice

[editar] Funções de membro

constrói uma faceta codecvt_byname novo
Original:
constructs a new codecvt_byname facet
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(função pública membro)
destrói uma faceta codecvt_byname
Original:
destructs a codecvt_byname facet
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(protegido função de membro)

Inherited from std::codecvt

Member types

Tipo de membro
Original:
Member type
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Definition
intern_type internT
extern_type externT
state_type stateT

Member objects

Nome do membro
Original:
Member name
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Type
id (estática) std::locale::id

Member functions

Invoca do_out
Original:
invokes do_out
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(of std::codecvt função pública membro) [edit]
Invoca do_in
Original:
invokes do_in
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(of std::codecvt função pública membro) [edit]
Invoca do_unshift
Original:
invokes do_unshift
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(of std::codecvt função pública membro) [edit]
Invoca do_encoding
Original:
invokes do_encoding
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(of std::codecvt função pública membro) [edit]
Invoca do_always_noconv
Original:
invokes do_always_noconv
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(of std::codecvt função pública membro) [edit]
Invoca do_length
Original:
invokes do_length
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(of std::codecvt função pública membro) [edit]
Invoca do_max_length
Original:
invokes do_max_length
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(of std::codecvt função pública membro) [edit]

Protected member functions

[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 of std::codecvt função de membro) [edit]
[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 of std::codecvt função de membro) [edit]
[virtual]
gera a seqüência de caracteres de terminação de caracteres externT para conversão incompleta
Original:
generates the termination character sequence of externT characters for incomplete conversion
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(virtual protegido of std::codecvt função de membro) [edit]
[virtual]
retorna o número de caracteres externT necessários para produzir um caráter internt, se constante
Original:
returns the number of externT characters necessary to produce one internT character, if constant
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(virtual protegido of std::codecvt função de membro) [edit]
Testes se a faceta codifica uma conversão de identidade para todos os valores de argumentos válidos
Original:
tests if the facet encodes an identity conversion for all valid argument values
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(virtual protegido of std::codecvt função de membro) [edit]
[virtual]
calcula o comprimento da corda externT que seria consumida por conversão em tampão internt dado
Original:
calculates the length of the externT string that would be consumed by conversion into given internT buffer
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(virtual protegido of std::codecvt função de membro) [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 of std::codecvt função de membro) [edit]


Inherited from std::codecvt_base

Tipo de membro
Original:
Member type
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Definition
enum result { ok, partial, error, noconv };
Tipo de enumeração sem escopo
Original:
Unscoped enumeration type
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Enumeração constante
Original:
Enumeration constant
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Definition
ok
conversão foi completado sem qualquer erro
Original:
conversion was completed with no error
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partial
nem todos os caracteres de fonte foram convertidos
Original:
not all source characters were converted
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error
encontrou um caractere inválido
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encountered an invalid character
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noconv
necessária nenhuma conversão de entrada, e os tipos de saída são os mesmos
Original:
no conversion required, input and output types are the same
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[editar] Exemplo

Este exemplo demonstra a leitura de um arquivo de GB18030-codificado usando a faceta codecvt de um local GB18030-consciente
Original:
This example demonstrates reading a GB18030-encoded file using the codecvt facet from a GB18030-aware locale
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#include <iostream>
#include <fstream>
#include <string>
#include <locale>
int main()
{
    // GB18030 narrow multibyte encoding
    std::ofstream("text.txt") << "\x7a"              // letter 'z', U+007a
                                 "\x81\x30\x89\x38"  // letter 'ß', U+00df
                                 "\xcb\xae"          // CJK ideogram '水' (water), U+6c34
                                 "\x94\x32\xbc\x35"; // musical sign '𝄋' (segno), U+1d10b
    std::wifstream fin("text.txt");
    fin.imbue(std::locale(fin.getloc(),
              new std::codecvt_byname<wchar_t, char, std::mbstate_t>("zh_CN.gb18030")));
    for(wchar_t c; fin.get(c); )
        std::cout << std::hex << std::showbase << c << '\n';
}

Output:

0x7a
0xdf
0x6c34
0x1d10b

[editar] Veja também

Converte entre codificações de caracteres, incluindo UTF-8, UTF-16, UTF-32
Original:
converts between character encodings, including UTF-8, UTF-16, UTF-32
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(modelo de classe) [edit]