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std::codecvt_mode

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C++
 
ローカライゼーションライブラリ
ロケールおよびファセット
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Locales and facets
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locale
文字分類
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Character classification
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変換
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Conversions
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ファセットカテゴリの基底クラスです
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Facet category base classes
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ファセットカテゴリ
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Facet categories
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ロケール固有のファセット
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Locale-specific facets
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コー​​ド変換ファセット
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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ロケール
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C locale
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Defined in header <locale>
enum codecvt_mode {

    consume_header = 4,
    generate_header = 2,
    little_endian = 1

};
ファセットstd::codecvt_utf8、std::codecvt_utf16、そしてstd::codecvt_utf8_utf16ユニコード文字列変換のオプション機能を指定するテンプレート引数として型std::codecvt_modeの任意の値を受け入れ.
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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[編集] 定数

Defined in header <locale>
値
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Value
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 Meaning
little_endian
入力はリトルエンディアンのバイト順序（のみ、デフォルトはビッグエンディアンのUTF-16の入力に適用されます）であると仮定します
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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
入力シーケンスの開始時に存在して、（UTF-16の場合）の場合、バイトオーダーマークを消費し、復号化するため、それが指定するバイトオーダー入力の残りの部分に依存しています
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
出力シーケンスの先頭にバイトオーダーマークを出力する
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output the byte order mark at the start of the output sequence
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認識バイト順マークは、次のとおりです
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The recognized byte order marks are:
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0xfe 0xff
UTF-16ビッグエンディアン
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UTF-16 big-endian
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0xff 0xfe
UTF-16のリトルエンディアン
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UTF-16 little-endian
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0xef 0xbb 0xbf
UTF-8（エンディアンへの影響はありません）
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UTF-8 (no effect on endianness)
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BOM（Byte Order Mark）で始まるファイルを読み込むときstd::consume_headerが選択されていない場合は、Unicode文字U + FEFF（ZERO WIDTH改行なしスペース）は、文字列の内容の最初の文字のように読むことができます.
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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[編集] 例

次の例では、UTF-8のBOMを消費して示しています
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

[編集] も参照してください
UTF-8、UTF-16、UTF-32を含む文字エンコーディング間の変換を行います
Original:
converts between character encodings, including UTF-8, UTF-16, UTF-32
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(クラステンプレート) [edit]
(C++11)
UTF-8とUCS2/UCS4の間で変換を行います
Original:
converts between UTF-8 and UCS2/UCS4
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(クラステンプレート) [edit]
(C++11)
UTF-16とUCS2/UCS4の間で変換を行います
Original:
converts between UTF-16 and UCS2/UCS4
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(クラステンプレート) [edit]
(C++11)
 converts between UTF-8 and UTF-16
(クラステンプレート) [edit]
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