std::codecvt_mode

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C++
 
本地化库
语言环境方面
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Locales and facets
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locale
字符分类
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Character classification
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转换
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Conversions
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wstring_convert（C++11）
wbuffer_convert（C++11）
小面类的基类
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Facet category base classes
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小面类
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Facet categories
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特定于语言环境的方面
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Locale-specific facets
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代码转换方面
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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语言环境
Original:
C locale
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Defined in header <locale>
enum codecvt_mode {

    consume_header = 4,
    generate_header = 2,
    little_endian = 1

};
方面std::codecvt_utf8，std::codecvt_utf16，std::codecvt_utf8_utf16接受一个可选的值类型std::codecvt_mode作为一个模板参数，它指定的unicode字符串转换的可选功能.
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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[编辑] 常量

Defined in header <locale>
值
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Value
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 Meaning
little_endian
假设输入的是little-endian字节顺序（只适用于UTF-16的输入，默认的是big-endian）
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
消耗的字节顺序标记，如果存在的话在开始的输入序列（UTF-16的情况下），依靠它指定的字节顺序解码其余的输入
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
输出的输出序列的起始处的字节顺序标记
Original:
output the byte order mark at the start of the output sequence
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认可的字节顺序标记
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The recognized byte order marks are:
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0xfe 0xff
UTF-16 big-endian的
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UTF-16 big-endian
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0xff 0xfe
UTF-16 little-endian的
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UTF-16 little-endian
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0xef 0xbb 0xbf
UTF-8（排列顺序）没有影响
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UTF-8 (no effect on endianness)
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如果std::consume_header没有选择当读取一个文件开头的字节顺序标记，Unicode字符U + FEFF（零宽度不换行空格）将读取的第一个字符的字符串内容.
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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[编辑] 为例

下面的示例演示使用UTF-8 BOM
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';
}

Output: 

0x7a
0x6c34
0x1d10b

[编辑] 另请参阅
之间进行转换的字符编码​​，包括UTF-8，UTF-16，UTF-32
Original:
converts between character encodings, including UTF-8, UTF-16, UTF-32
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（类模板） [edit]
（C++11）
之间的转换UTF-8和UCS2/UCS4
Original:
converts between UTF-8 and UCS2/UCS4
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（类模板） [edit]
（C++11）
之间的转换UTF-16和UCS2/UCS4
Original:
converts between UTF-16 and UCS2/UCS4
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（类模板） [edit]
（C++11）
 converts between UTF-8 and UTF-16
（类模板） [edit]
来自“http://zh.cppreference.com/mwiki/index.php?title=cpp/locale/codecvt_mode&oldid=28406”