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std::codecvt_byname

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C++
 
Локализация библиотеки
Языки и граней
Original:
Locales and facets
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locale
Персонаж классификации
Original:
Character classification
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Преобразования
Original:
Conversions
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Facet классов категории базу
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Facet category base classes
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Facet категорий
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Facet categories
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Язык конкретных аспектов
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Locale-specific facets
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Код аспекты преобразования
Original:
Code conversion facets
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codecvt_utf8(C++11)
codecvt_utf16(C++11)
C локали
Original:
C locale
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Заголовочный файл <locale>
template< class internT, class externT, class stateT >
class codecvt_byname : public std::codecvt<internT, externT, stateT>;
std::codecvt_byname является std::codecvt аспект, который инкапсулирует многобайтовых / широкий характер правил преобразования локали указано на его строительство.
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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Четыре специализации осуществляется стандартной библиотеки
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Four specializations are provided by the standard library
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Определено в файле <locale>
std::codecvt_byname<char, char, std::mbstate_t>
тождественное преобразование
Original:
identity conversion
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std::codecvt_byname<char16_t, char, std::mbstate_t>
преобразования между UTF-16 и UTF-8 (начиная с C++11)
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conversion between UTF-16 and UTF-8 (начиная с C++11)
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std::codecvt_byname<char32_t, char, std::mbstate_t>
преобразования между UTF-32 и UTF-8 (начиная с C++11)
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conversion between UTF-32 and UTF-8 (начиная с C++11)
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std::codecvt_byname<wchar_t, char, std::mbstate_t>
локалей преобразования между строку широких и узких, возможно, многобайтовые, строка
Original:
locale-specific conversion between wide string and narrow, possibly multibyte, string
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Содержание

[править] Член функций
строит новую грань codecvt_byname
Original:
constructs a new codecvt_byname facet
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(public функция-член)
разрушает codecvt_byname грань
Original:
destructs a codecvt_byname facet
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(protected функция-член)

Унаследован от std::codecvt

Member types

Член типа
Original:
Member type
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 Definition
intern_type internT
extern_type externT
state_type stateT

Member objects

Имя пользователя
Original:
Member name
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 Type
id (статическим) std::locale::id

Member functions
Вызывает do_out
Original:
invokes do_out
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(public функция-член std::codecvt) [edit]
Вызывает do_in
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invokes do_in
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(public функция-член std::codecvt) [edit]
Вызывает do_unshift
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invokes do_unshift
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(public функция-член std::codecvt) [edit]
Вызывает do_encoding
Original:
invokes do_encoding
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(public функция-член std::codecvt) [edit]
Вызывает do_always_noconv
Original:
invokes do_always_noconv
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(public функция-член std::codecvt) [edit]
Вызывает do_length
Original:
invokes do_length
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(public функция-член std::codecvt) [edit]
Вызывает do_max_length
Original:
invokes do_max_length
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(public функция-член std::codecvt) [edit]

Protected member functions

[virtual]
преобразует строку из internT в externT, например, при записи в файл
Original:
converts a string from internT to externT, such as when writing to file
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(virtual protected std::codecvt функция-член) [edit]
[virtual]
преобразует строку из externT в internT, например, при чтении из файла
Original:
converts a string from externT to internT, such as when reading from file
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(virtual protected std::codecvt функция-член) [edit]
[virtual]
генерирует последовательность прекращения характер externT символов для неполного преобразования
Original:
generates the termination character sequence of externT characters for incomplete conversion
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(virtual protected std::codecvt функция-член) [edit]
[virtual]
возвращает количество externT символы, необходимые для производства одной internT характер, если постоянная
Original:
returns the number of externT characters necessary to produce one internT character, if constant
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(virtual protected std::codecvt функция-член) [edit]
[virtual]
Тесты, если грань кодирует тождественное преобразование для всех допустимых значений аргумента
Original:
tests if the facet encodes an identity conversion for all valid argument values
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(virtual protected std::codecvt функция-член) [edit]
[virtual]
вычисляет длину externT строку, которая будет потребляться преобразования в данной internT буфера
Original:
calculates the length of the externT string that would be consumed by conversion into given internT buffer
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(virtual protected std::codecvt функция-член) [edit]
[virtual]
возвращает максимальное число externT символы, которые могут быть преобразованы в единый internT характер
Original:
returns the maximum number of externT characters that could be converted into a single internT character
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(virtual protected std::codecvt функция-член) [edit]


Унаследован от std::codecvt_base

Член типа
Original:
Member type
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 Definition
enum result { ok, partial, error, noconv };
Незаданной типа перечисления
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Unscoped enumeration type
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Перечисление постоянно
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Enumeration constant
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 Definition
ok
Преобразование была завершена без ошибок
Original:
conversion was completed with no error
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partial
Не все символы источником были преобразованы
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not all source characters were converted
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error
встречается недопустимый символ
Original:
encountered an invalid character
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noconv
преобразование не требуется, вход и выход типов одинаковы
Original:
no conversion required, input and output types are the same
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[править] Пример

Этот пример демонстрирует чтение GB18030-закодированный файл, используя codecvt грани с GB18030-знать язык
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';
}

Вывод: 

0x7a
0xdf
0x6c34
0x1d10b

[править] См. также
новообращенные между кодировками, в том числе UTF-8, UTF-16, UTF-32
Original:
converts between character encodings, including UTF-8, UTF-16, UTF-32
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(шаблон класса) [edit]
Источник — «http://ru.cppreference.com/mwiki/index.php?title=cpp/locale/codecvt_byname&oldid=29346»