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std::codecvt_mode

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Lokalisierungen Bibliothek
Locales und Facetten
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Locales and facets
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locale
Buchstaben-Klassifikation
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Character classification
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Conversions
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Conversions
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Facet Kategorie Basisklassen
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Facet category base classes
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Facet Kategorien
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Facet categories
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Locale-spezifische Facetten
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Locale-specific facets
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Code-Konvertierung Facetten
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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 locale
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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

};
Die Facetten std::codecvt_utf8, std::codecvt_utf16 und std::codecvt_utf8_utf16 akzeptieren einen optionalen Wert vom Typ std::codecvt_mode als Vorlage Argument, das optionale Merkmale der Unicode-String-Konvertierung gibt .
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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[Bearbeiten] Konstanten

Defined in header <locale>
Value
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Value
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Meaning
little_endian
übernehmen die Eingabe im Little-Endian-Byte-Reihenfolge (gilt für UTF-16-Eingang nur die Standard-Big-Endian ist)
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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
verbrauchen Bytereihenfolgemarkierung, falls vorhanden zu Beginn Eingabesequenz, und (im Falle von UTF-16), auf dem Byte-Reihenfolge angibt es zum Decodieren der Rest des Eingangs verlassen
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
Ausgabe der Bytereihenfolgemarkierung am Beginn des Ausgangs-Sequenz
Original:
output the byte order mark at the start of the output sequence
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Die anerkannten Bytereihenfolgemarkierungen sind:
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The recognized byte order marks are:
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0xfe 0xff
UTF-16 Big-Endian
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UTF-16 big-endian
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0xff 0xfe
UTF-16 Little-Endian
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UTF-16 little-endian
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0xef 0xbb 0xbf
UTF-8 (keine Auswirkung auf endianness)
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UTF-8 (no effect on endianness)
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Wenn std::consume_header nicht ausgewählt wird, wenn eine Datei lesen, beginnend mit Bytereihenfolgemarkierung wird das Unicode-Zeichen U + FEFF (Zero width non-breaking space) als erstes Zeichen des Strings Inhalte gelesen werden .
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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[Bearbeiten] Beispiel

Das folgende Beispiel demonstriert verzehrt den 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

[Bearbeiten] Siehe auch

Konvertiten zwischen Zeichenkodierungen, inklusive UTF-8, UTF-16, UTF-32
Original:
converts between character encodings, including UTF-8, UTF-16, UTF-32
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(Klassen-Template) [edit]
konvertiert zwischen UTF-8 und UCS2/UCS4
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converts between UTF-8 and UCS2/UCS4
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(Klassen-Template) [edit]
konvertiert zwischen UTF-16 und UCS2/UCS4
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converts between UTF-16 and UCS2/UCS4
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(Klassen-Template) [edit]
converts between UTF-8 and UTF-16
(Klassen-Template) [edit]