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std::codecvt

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< cpp‎ | locale

 
 
Biblioteca localizações
Localidades e facetas
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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>
template<

    class InternT,
    class ExternT,
    class State

> class codecvt;
Classe std::codecvt conversão encapsula de cadeias de caracteres, incluindo largura e multibyte, a partir de uma codificação para outro. Todos os arquivos I / O operações realizadas através std::basic_fstream<CharT> usar a faceta std::codecvt<CharT, char, std::mbstate_t> do local imbuído na corrente.
Original:
Class std::codecvt encapsulates conversion of character strings, including wide and multibyte, from one encoding to another. All file I/O operations performed through std::basic_fstream<CharT> use the std::codecvt<CharT, char, std::mbstate_t> facet of the locale imbued in the stream.
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cpp/locale/codecvt basecpp/locale/locale/facetstd-codecvt-inheritance.svg
Sobre esta imagem

Inheritance diagram

Quatro especializações são fornecidos pela biblioteca padrão e são implementadas por todos os objetos localidade criado em um programa em C + +:
Original:
Four specializations are provided by the standard library and are implemented by all locale objects created in a C++ program:
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Defined in header <locale>
std::codecvt<char, char, std::mbstate_t>
conversão de identidade
Original:
identity conversion
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std::codecvt<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<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<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] Tipos de membro

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

[editar] Objetos Membros

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

[editar] Funções de membro

constrói uma faceta codecvt novo
Original:
constructs a new codecvt facet
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(função pública membro)
destrói uma faceta codecvt
Original:
destructs a codecvt facet
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(protegido função de membro)
Invoca do_out
Original:
invokes do_out
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(função pública membro) [edit]
Invoca do_in
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invokes do_in
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(função pública membro) [edit]
Invoca do_unshift
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invokes do_unshift
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(função pública membro) [edit]
Invoca do_encoding
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invokes do_encoding
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(função pública membro) [edit]
Invoca do_always_noconv
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invokes do_always_noconv
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(função pública membro) [edit]
Invoca do_length
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invokes do_length
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(função pública membro) [edit]
Invoca do_max_length
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invokes do_max_length
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(função pública membro) [edit]

[editar] Protegido funções de membro

[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]
[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]
[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 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 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 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 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 função de membro) [edit]

Inherited from std::codecvt_base

Tipo de membro
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Member type
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Definition
enum result { ok, partial, error, noconv };
Tipo de enumeração sem escopo
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Unscoped enumeration type
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Enumeração constante
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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

Os exemplos a seguir lê um arquivo UTF-8 usando uma localidade que implementa conversão UTF-8 em codecvt <wchar_t, char, mbstate_t>
Original:
The following examples reads a UTF-8 file using a locale which implements UTF-8 conversion in codecvt<wchar_t, char, mbstate_t>
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#include <iostream>
#include <fstream>
#include <string>
#include <locale>
#include <iomanip>
int main()
{
    // UTF-8 narrow multibyte encoding
    std::ofstream("text.txt") << u8"z\u00df\u6c34\U0001d10b"; // or u8"zß水𝄋"
                                           // or "\x7a\xc3\x9f\xe6\xb0\xb4\xf0\x9d\x84\x8b";
    std::wifstream fin("text.txt");
    fin.imbue(std::locale("en_US.UTF-8")); // this locale's codecvt<wchar_t, char, mbstate_t>
                                           // converts UTF-8 to UCS4
    std::cout << "The UTF-8 file contains the following wide characters: \n";
    for(wchar_t c; fin >> c; )
        std::cout << "U+" << std::hex << std::setw(4) << std::setfill('0') << c << '\n';
}

Output:

The UTF-8 file contains the following wide characters:
U+007a
U+00df
U+6c34
U+1d10b

[editar] Veja também

Character
conversions
narrow multibyte
(char)
UTF-8
(char)
UTF-16
(char16_t)
UTF-16 mbrtoc16 / c16rtomb codecvt<char16_t, char, mbstate_t>
codecvt_utf8_utf16<char16_t>
codecvt_utf8_utf16<char32_t>
codecvt_utf8_utf16<wchar_t>
N/A
UCS2 No codecvt_utf8<char16_t> codecvt_utf16<char16_t>
UTF-32/UCS4
(char32_t)
mbrtoc32 / c32rtomb codecvt<char32_t, char, mbstate_t>
codecvt_utf8<char32_t>
codecvt_utf16<char32_t>
UCS2/UCS4
(wchar_t)
No codecvt_utf8<wchar_t> codecvt_utf16<wchar_t>
wide
(wchar_t)
codecvt<wchar_t, char, mbstate_t>
mbsrtowcs / wcsrtombs
No No
define erros de conversão de caracteres
Original:
defines character conversion errors
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(modelo de classe)
cria uma faceta codecvt para a localidade chamada
Original:
creates a codecvt facet for the named locale
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(modelo de classe)
converte entre UTF-8 e UCS2/UCS4
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converts between UTF-8 and UCS2/UCS4
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(modelo de classe) [edit]
converte entre UTF-16 e UCS2/UCS4
Original:
converts between UTF-16 and UCS2/UCS4
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(modelo de classe) [edit]
converts between UTF-8 and UTF-16
(modelo de classe) [edit]