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std::codecvt_mode

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Bibliothèque localisations
Locales et facettes
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Locales and facets
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locale
Classification des caractères
Original:
Character classification
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Conversions
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Conversions
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Classes de facettes catégorie de base
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Facet category base classes
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Catégories de facettes
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Facet categories
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Spécifique aux paramètres régionaux facettes
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Locale-specific facets
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Facettes de conversion de code
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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

};
Les facettes std::codecvt_utf8, std::codecvt_utf16 et std::codecvt_utf8_utf16 accepter une valeur optionnelle de std::codecvt_mode type comme argument de modèle, qui spécifie les caractéristiques optionnelles de la conversion de la chaîne unicode .
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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[modifier] Constantes

Defined in header <locale>
Valeur
Original:
Value
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Meaning
little_endian
suppose l'entrée est dans l'ordre little-endian (s'applique à UTF-16 d'entrée uniquement, la valeur par défaut est 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
consommer la marque d'ordre d'octet, si elle est présente au début de la séquence d'entrée, et (dans le cas de l'UTF-16), s'appuient sur l'ordre des octets qu'il spécifie pour décoder le reste de l'entrée
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
fournir en sortie la marque d'ordre d'octets au début de la séquence de sortie
Original:
output the byte order mark at the start of the output sequence
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Les marques d'ordre d'octet reconnus sont les suivants:
Original:
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 (pas d'effet sur boutisme)
Original:
UTF-8 (no effect on endianness)
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Si std::consume_header n'est pas sélectionné lors de la lecture d'un fichier commençant par marque d'ordre d'octet, le caractère Unicode U + FEFF (Zero largeur un espace insécable) sera lu comme premier caractère de la chaîne content .
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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[modifier] Exemple

L'exemple suivant illustre la consommation du BOM 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';
}

Résultat :

0x7a
0x6c34
0x1d10b

[modifier] Voir aussi

convertis entre les codages de caractères, y compris UTF-8, UTF-16, UTF-32
Original:
converts between character encodings, including UTF-8, UTF-16, UTF-32
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(classe générique) [edit]
convertit entre UTF-8 et UCS2/UCS4
Original:
converts between UTF-8 and UCS2/UCS4
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(classe générique) [edit]
convertit entre UTF-16 et UCS2/UCS4
Original:
converts between UTF-16 and UCS2/UCS4
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(classe générique) [edit]
converts between UTF-8 and UTF-16
(classe générique) [edit]