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std::codecvt_mode

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C++
 
Локализация библиотеки
Языки и граней
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Locales and facets
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locale
Персонаж классификации
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Character classification
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Преобразования
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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
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Code conversion facets
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codecvt_utf8(C++11)
codecvt_utf16(C++11)
codecvt_utf8_utf16(C++11)
codecvt_mode(C++11)
C локали
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C locale
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Заголовочный файл <locale>
enum codecvt_mode {

    consume_header = 4,
    generate_header = 2,
    little_endian = 1

};
Граней std::codecvt_utf8, std::codecvt_utf16, и std::codecvt_utf8_utf16 принять дополнительное значение типа std::codecvt_mode в качестве аргумента шаблона, который определяет дополнительные функции преобразования Unicode строки.
Original:
The facets std::codecvt_utf8, std::codecvt_utf16, and std::codecvt_utf8_utf16 accept an optional value of type std::codecvt_mode as a template argument, which specifies optional features of the unicode string conversion.
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[править] Константы

Определено в файле <locale>
Value
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Value
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 Meaning
little_endian
Предположим, вход находится в маленькой обратным порядком байтов (относится к UTF-16 только вход, то по умолчанию от старшего к младшему)
Original:
assume the input is in little-endian byte order (applies to UTF-16 input only, the default is big-endian)
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consume_header
потребляют метку порядка байтов, если он присутствует в начале входной последовательности, и (в случае UTF-16), полагаются на порядок байт это указывает для декодирования остальных вход
Original:
consume the byte order mark, if present at the start of input sequence, and (in case of UTF-16), rely on the byte order it specifies for decoding the rest of the input
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generate_header
выводить знак порядка байтов в начале выходной последовательности
Original:
output the byte order mark at the start of the output sequence
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Признанные марки порядок байтов являются:
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The recognized byte order marks are:
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0xfe 0xff
UTF-16 с обратным порядком байтов
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UTF-16 big-endian
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0xff 0xfe
UTF-16 с прямым порядком байтов
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UTF-16 little-endian
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0xef 0xbb 0xbf
UTF-8 (не влияет на порядок байтов)
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UTF-8 (no effect on endianness)
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Если std::consume_header не выбрано при чтении файла, начиная с метку порядка байтов, Юникод U + FEFF (Zero шириной неразрывный пробел) будет читаться как первый символ строки содержания.
Original:
If std::consume_header is not selected when reading a file beginning with byte order mark, the Unicode character U+FEFF (Zero width non-breaking space) will be read as the first character of the string content.
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[править] Пример

В следующем примере показано много UTF-8
Original:
The following example demonstrates consuming the UTF-8 BOM
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#include <fstream>
#include <iostream>
#include <string>
#include <locale>
#include <codecvt>
int main()
{
    // UTF-8 data with BOM
    std::ofstream("text.txt") << u8"\ufeffz\u6c34\U0001d10b";
    // read the UTF8 file, skipping the BOM
    std::wifstream fin("text.txt");
    fin.imbue(std::locale(fin.getloc(),
                          new std::codecvt_utf8<wchar_t, 0x10ffff, std::consume_header>));
    for(wchar_t c; fin.get(c); )
        std::cout << std::hex << std::showbase << c << '\n';
}

Вывод: 

0x7a
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]
(C++11)
преобразования между UTF-8 и UCS2/UCS4
Original:
converts between UTF-8 and UCS2/UCS4
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(шаблон класса) [edit]
(C++11)
преобразования между UTF-16 и UCS2/UCS4
Original:
converts between UTF-16 and UCS2/UCS4
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(шаблон класса) [edit]
(C++11)
 converts between UTF-8 and UTF-16
(шаблон класса) [edit]
Источник — «http://ru.cppreference.com/mwiki/index.php?title=cpp/locale/codecvt_mode&oldid=29340»