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std::codecvt_mode

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C++
 
Localizzazioni libreria
Impostazioni internazionali e sfaccettature
Original:
Locales and facets
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locale
Carattere classificazione
Original:
Character classification
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Conversioni
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Conversions
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Facet categoria classi di base
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Facet category base classes
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Facet categorie
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Facet categories
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Locale specifici aspetti
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Locale-specific facets
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Codice di conversione sfaccettature
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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
Original:
C locale
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Elemento definito nell'header <locale>
enum codecvt_mode {

    consume_header = 4,
    generate_header = 2,
    little_endian = 1

};
Le sfaccettature std::codecvt_utf8, std::codecvt_utf16 e std::codecvt_utf8_utf16 accettare un valore facoltativo di std::codecvt_mode tipo come argomento di modello, che specifica le caratteristiche opzionali del conversione di stringhe 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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[modifica] Costanti

Definizione nell'header <locale>
Valore
Original:
Value
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 Meaning
little_endian
assumere l'ingresso è in little-endian (vale a UTF-16 solo ingresso, l'impostazione predefinita è 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
consumare il byte order mark, se presente all'inizio della sequenza di ingresso, e (nel caso di UTF-16), affidarsi all'ordine byte specifica per decodificare il resto dell'input
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
emettere l'ordine dei byte all'inizio della sequenza di emissione
Original:
output the byte order mark at the start of the output sequence
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I riconosciuti byte order mark sono:
Original:
The recognized byte order marks are:
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0xfe 0xff
UTF-16 big-endian
Original:
UTF-16 big-endian
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0xff 0xfe
UTF-16 little-endian
Original:
UTF-16 little-endian
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0xef 0xbb 0xbf
UTF-8 (nessun effetto sulla endianness)
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UTF-8 (no effect on endianness)
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Se std::consume_header non è selezionata quando la lettura di un file che iniziano con byte order mark, il carattere Unicode U + FEFF (Zero width non-breaking space) sarà letto come primo carattere del contenuto della stringa.
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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[modifica] Esempio

L'esempio seguente mostra il consumo di 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

[modifica] Vedi anche
converte tra codifiche dei caratteri, tra cui UTF-8, UTF-16, UTF-32
Original:
converts between character encodings, including UTF-8, UTF-16, UTF-32
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(classe template) [modifica]
(C++11)
converte tra UTF-8 e UCS2/UCS4
Original:
converts between UTF-8 and UCS2/UCS4
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(classe template) [modifica]
(C++11)
converte tra UTF-16 e UCS2/UCS4
Original:
converts between UTF-16 and UCS2/UCS4
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(classe template) [modifica]
(C++11)
 converts between UTF-8 and UTF-16
(classe template) [modifica]
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/locale/codecvt_mode&oldid=26013"