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std::codecvt

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< cpp‎ | locale

 
 
Localizaciones biblioteca
Locales y facetas
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Locales and facets
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locale
Carácter clasificación
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Character classification
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Conversiones
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Conversions
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Facet clases categoría base
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Facet category base classes
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Categorías faceta
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Facet categories
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Específico de la localidad facetas
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Locale-specific facets
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Facetas código de conversión
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Code conversion facets
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codecvt_utf8(C++11)
codecvt_utf16(C++11)
C locale
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C locale
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Defined in header <locale>
template<

    class InternT,
    class ExternT,
    class State

> class codecvt;
Clase std::codecvt encapsula conversión de cadenas de caracteres, incluyendo ancho y multibyte, de una codificación a otra. Todos los archivos de E / S se realizan operaciones a través de std::basic_fstream<CharT> utilizar la faceta std::codecvt<CharT, char, std::mbstate_t> de la configuración regional imbuida en la corriente .
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
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Inheritance diagram

Cuatro especialidades son proporcionados por la biblioteca estándar y son aplicadas por todos los objetos creados en un entorno nacional C + + programa:
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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>
identidad de conversión
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identity conversion
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std::codecvt<char16_t, char, std::mbstate_t>
conversión entre UTF-16 y UTF-8 (desde C++11)
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conversion between UTF-16 and UTF-8 (desde C++11)
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std::codecvt<char32_t, char, std::mbstate_t>
conversión entre UTF-32 y UTF-8 (desde C++11)
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conversion between UTF-32 and UTF-8 (desde C++11)
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std::codecvt<wchar_t, char, std::mbstate_t>
específico de la localidad de conversión entre la cadena y la cadena de ancho estrecho, posiblemente multibyte
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locale-specific conversion between wide string and narrow, possibly multibyte, string
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Contenido

[editar] Tipos de miembros

Miembro de tipo
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Member type
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Definition
intern_type internT
extern_type externT
state_type stateT

[editar] Objetos miembros

Persona
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Member name
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Type
id (estático) std::locale::id

[editar] Las funciones miembro

construye una nueva faceta codecvt
Original:
constructs a new codecvt facet
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(miembro público función)
destructs una faceta codecvt
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destructs a codecvt facet
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(protegidos función miembro)
Invoca do_out
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invokes do_out
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(miembro público función) [edit]
Invoca do_in
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invokes do_in
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(miembro público función) [edit]
Invoca do_unshift
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invokes do_unshift
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(miembro público función) [edit]
Invoca do_encoding
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invokes do_encoding
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(miembro público función) [edit]
Invoca do_always_noconv
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invokes do_always_noconv
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(miembro público función) [edit]
Invoca do_length
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invokes do_length
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(miembro público función) [edit]
Invoca do_max_length
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invokes do_max_length
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(miembro público función) [edit]

[editar] Protegido funciones miembro

[virtual]
convierte una cadena de internt a externT, tales como cuando se escribe en el archivo
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converts a string from internT to externT, such as when writing to file
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(virtuales protegidos miembro de función) [edit]
[virtual]
convierte una cadena de externT a internt, como cuando al leer el archivo
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converts a string from externT to internT, such as when reading from file
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(virtuales protegidos miembro de función) [edit]
[virtual]
genera la secuencia de caracteres de terminación de caracteres externT para la conversión incompleta
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generates the termination character sequence of externT characters for incomplete conversion
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(virtuales protegidos miembro de función) [edit]
[virtual]
devuelve el número de caracteres externT necesarias para producir un carácter internt, si es constante
Original:
returns the number of externT characters necessary to produce one internT character, if constant
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(virtuales protegidos miembro de función) [edit]
Comprueba si la faceta codifica una conversión de identidad para todos los valores de los argumentos válidos
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tests if the facet encodes an identity conversion for all valid argument values
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(virtuales protegidos miembro de función) [edit]
[virtual]
calcula la longitud de la cadena externT que sería consumida por conversión en tampón internt dado
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calculates the length of the externT string that would be consumed by conversion into given internT buffer
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(virtuales protegidos miembro de función) [edit]
devuelve el número máximo de caracteres externT que se podrían transformar en un único carácter internt
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returns the maximum number of externT characters that could be converted into a single internT character
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(virtuales protegidos miembro de función) [edit]

Inherited from std::codecvt_base

Miembro de tipo
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Member type
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Definition
enum result { ok, partial, error, noconv };
Tipo de enumeración sin ámbito
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Unscoped enumeration type
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Enumeración constante
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Enumeration constant
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Definition
ok
conversión se completó con ningún error
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conversion was completed with no error
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partial
no todos los caracteres de código se convirtieron
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not all source characters were converted
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error
encontró un carácter no válido
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encountered an invalid character
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noconv
sin necesidad de conversión, tipos de entrada y salida son los mismos
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no conversion required, input and output types are the same
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[editar] Ejemplo

Los siguientes ejemplos se lee un archivo UTF-8 con una configuración regional que implementa UTF-8 en la conversión 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] Ver también

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 los errores de conversión de caracteres
Original:
defines character conversion errors
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(clase de plantilla)
crea una faceta codecvt para la localidad nombrada
Original:
creates a codecvt facet for the named locale
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(clase de plantilla)
la conversión entre UTF-8 y UCS2/UCS4
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converts between UTF-8 and UCS2/UCS4
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(clase de plantilla) [edit]
la conversión entre UTF-16 y UCS2/UCS4
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converts between UTF-16 and UCS2/UCS4
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(clase de plantilla) [edit]
converts between UTF-8 and UTF-16
(clase de plantilla) [edit]