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std::codecvt_utf8

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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 <codecvt>
template<

    class Elem,
    unsigned long Maxcode = 0x10ffff,
    std::codecvt_mode Mode = (std::codecvt_mode)0

> class codecvt_utf8 : public std::codecvt<Elem, char, std::mbstate_t>;
std::codecvt_utf8 es una faceta std::codecvt que encapsula la conversión entre una cadena UTF-8 bytes codificada y UCS2 o UCS4 cadena de caracteres (en función del tipo de Elem). Esta faceta codecvt se puede utilizar para leer y escribir archivos UTF-8, tanto de texto y binarios .
Original:
std::codecvt_utf8 is a std::codecvt facet which encapsulates conversion between a UTF-8 encoded byte string and UCS2 or UCS4 character string (depending on the type of Elem). This codecvt facet can be used to read and write UTF-8 files, both text and binary.
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Contenido

[editar] Parámetros de plantilla

Elem -
ya sea char16_t, char32_t, o wchar_t
Original:
either char16_t, char32_t, or wchar_t
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Maxcode -
el valor más grande de Elem que esta faceta se leer o escribir sin error
Original:
the largest value of Elem that this facet will read or write without error
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Mode -
una constante de std::codecvt_mode tipo
Original:
a constant of type std::codecvt_mode
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Inherited from std::codecvt

Member types

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

Member objects

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

Member functions

Invoca do_out
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invokes do_out
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(miembro público of std::codecvt función) [edit]
Invoca do_in
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invokes do_in
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(miembro público of std::codecvt función) [edit]
Invoca do_unshift
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invokes do_unshift
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(miembro público of std::codecvt función) [edit]
Invoca do_encoding
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invokes do_encoding
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(miembro público of std::codecvt función) [edit]
Invoca do_always_noconv
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invokes do_always_noconv
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(miembro público of std::codecvt función) [edit]
Invoca do_length
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invokes do_length
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(miembro público of std::codecvt función) [edit]
Invoca do_max_length
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invokes do_max_length
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(miembro público of std::codecvt función) [edit]

Protected member functions

[virtual]
convierte una cadena de internt a externT, tales como cuando se escribe en el archivo
Original:
converts a string from internT to externT, such as when writing to file
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(virtuales protegidos of std::codecvt 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 of std::codecvt miembro de función) [edit]
[virtual]
genera la secuencia de caracteres de terminación de caracteres externT para la conversión incompleta
Original:
generates the termination character sequence of externT characters for incomplete conversion
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[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 of std::codecvt miembro de función) [edit]
Comprueba si la faceta codifica una conversión de identidad para todos los valores de los argumentos válidos
Original:
tests if the facet encodes an identity conversion for all valid argument values
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(virtuales protegidos of std::codecvt miembro de función) [edit]
[virtual]
calcula la longitud de la cadena externT que sería consumida por conversión en tampón internt dado
Original:
calculates the length of the externT string that would be consumed by conversion into given internT buffer
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(virtuales protegidos of std::codecvt miembro de función) [edit]
devuelve el número máximo de caracteres externT que se podrían transformar en un único carácter internt
Original:
returns the maximum number of externT characters that could be converted into a single internT character
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(virtuales protegidos of std::codecvt 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
Original:
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
Original:
no conversion required, input and output types are the same
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[editar] Ejemplo

El siguiente ejemplo muestra la diferencia entre UCS2/UTF-8 y UTF-16/UTF-8 conversiones: el tercer personaje en la serie no es válida carácter UCS2 .
Original:
The following example demonstrates the difference between UCS2/UTF-8 and UTF-16/UTF-8 conversions: the third character in the string is not a valid UCS2 character.
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#include <iostream>
#include <string>
#include <locale>
#include <codecvt>
int main()
{
    // UTF-8 data. The character U+1d10b, musical sign segno, does not fit in UCS2
    std::string utf8 = u8"z\u6c34\U0001d10b";
 
    // the UTF-8 / UTF-16 standard conversion facet
    std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t> utf16conv;
    std::u16string utf16 = utf16conv.from_bytes(utf8);
    std::cout << "UTF16 conversion produced " << utf16.size() << " code points:\n";
    for(char16_t c : utf16)
        std::cout << std::hex << std::showbase << c << '\n';
 
    // the UTF-8 / UCS2 standard conversion facet
    std::wstring_convert<std::codecvt_utf8<char16_t>, char16_t> ucs2conv;
    try {
        std::u16string ucs2 = ucs2conv.from_bytes(utf8);
    } catch(const std::range_error& e) {
        std::u16string ucs2 = ucs2conv.from_bytes(utf8.substr(0, ucs2conv.converted()));
        std::cout << "UCS2 failed after producing " << std::dec << ucs2.size()<<" characters:\n";
        for(char16_t c : ucs2)
            std::cout << std::hex << std::showbase << c << '\n';
    }
}

Output:

UTF16 conversion produced 4 code points:
0x7a
0x6c34
0xd834
0xdd0b
UCS2 failed after producing 2 characters:
0x7a
0x6c34

[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
Convierte entre codificaciones de caracteres, incluyendo UTF-8, UTF-16, UTF-32
Original:
converts between character encodings, including UTF-8, UTF-16, UTF-32
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(clase de plantilla) [edit]
etiquetas para alterar el comportamiento de las facetas codecvt estándar
Original:
tags to alter behavior of the standard codecvt facets
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(clase) [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]