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std::codecvt_byname

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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)
C locale
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C locale
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Defined in header <locale>
template< class internT, class externT, class stateT >
class codecvt_byname : public std::codecvt<internT, externT, stateT>;
std::codecvt_byname ist ein std::codecvt Facette, die Multibyte / wide Zeichenkonvertierung eines Gebietsschemas bei der Konstruktion festgelegt kapselt .
Original:
std::codecvt_byname is a std::codecvt facet which encapsulates multibyte/wide character conversion rules of a locale specified at its construction.
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Vier Spezialisierungen werden durch die Standard-Bibliothek zur Verfügung gestellt
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Four specializations are provided by the standard library
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Defined in header <locale>
std::codecvt_byname<char, char, std::mbstate_t>
Identitätskonvertierung
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identity conversion
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std::codecvt_byname<char16_t, char, std::mbstate_t>
Konvertierung zwischen UTF-16 und UTF-8 (seit C++11)
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conversion between UTF-16 and UTF-8 (seit C++11)
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std::codecvt_byname<char32_t, char, std::mbstate_t>
Konvertierung zwischen UTF-32 und UTF-8 (seit C++11)
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conversion between UTF-32 and UTF-8 (seit C++11)
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std::codecvt_byname<wchar_t, char, std::mbstate_t>
locale-spezifischen Konvertierung zwischen breiten und schmalen String, möglicherweise Multibyte, string
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locale-specific conversion between wide string and narrow, possibly multibyte, string
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Inhaltsverzeichnis

[Bearbeiten] Member-Funktionen

baut eine neue codecvt_byname Facette
Original:
constructs a new codecvt_byname facet
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(öffentliche Elementfunktion)
zerstört sich eine codecvt_byname Facette
Original:
destructs a codecvt_byname facet
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(geschützt Member-Funktion)

Inherited from std::codecvt

Member types

Mitglied Typ
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Member type
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Definition
intern_type internT
extern_type externT
state_type stateT

Member objects

Member name
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Member name
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Type
id (statisch) std::locale::id

Member functions

Beruft do_out
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invokes do_out
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(öffentliche Elementfunktion of std::codecvt) [edit]
Beruft do_in
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invokes do_in
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(öffentliche Elementfunktion of std::codecvt) [edit]
Beruft do_unshift
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invokes do_unshift
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(öffentliche Elementfunktion of std::codecvt) [edit]
Beruft do_encoding
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invokes do_encoding
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(öffentliche Elementfunktion of std::codecvt) [edit]
Beruft do_always_noconv
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invokes do_always_noconv
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(öffentliche Elementfunktion of std::codecvt) [edit]
Beruft do_length
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invokes do_length
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(öffentliche Elementfunktion of std::codecvt) [edit]
Beruft do_max_length
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invokes do_max_length
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(öffentliche Elementfunktion of std::codecvt) [edit]

Protected member functions

[virtuell]
wandelt eine Zeichenkette aus Internt zu externT, wie beim Schreiben in eine Datei
Original:
converts a string from internT to externT, such as when writing to file
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(virtuellen geschützten Member-Funktion of std::codecvt) [edit]
[virtuell]
wandelt eine Zeichenkette aus externT um Internt wie beim Lesen aus Datei
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converts a string from externT to internT, such as when reading from file
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(virtuellen geschützten Member-Funktion of std::codecvt) [edit]
[virtuell]
generiert die Beendigung Ziffernfolge externT Zeichen für unvollständige Umsetzung
Original:
generates the termination character sequence of externT characters for incomplete conversion
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(virtuellen geschützten Member-Funktion of std::codecvt) [edit]
[virtuell]
gibt die Anzahl der externT Zeichen notwendig, um ein Internt Charakter zu produzieren, wenn konstant
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returns the number of externT characters necessary to produce one internT character, if constant
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(virtuellen geschützten Member-Funktion of std::codecvt) [edit]
testet, ob der Facette kodiert eine Identität Konvertierung für alle gültiges Argument Werte
Original:
tests if the facet encodes an identity conversion for all valid argument values
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(virtuellen geschützten Member-Funktion of std::codecvt) [edit]
[virtuell]
berechnet die Länge der Zeichenfolge, externT durch Umwandlung in gegebenen Internt Puffer verbraucht würde
Original:
calculates the length of the externT string that would be consumed by conversion into given internT buffer
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(virtuellen geschützten Member-Funktion of std::codecvt) [edit]
[virtuell]
gibt die maximale Anzahl von externT Zeichen, die in einem einzigen Internt Zeichen umgewandelt werden konnte
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returns the maximum number of externT characters that could be converted into a single internT character
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(virtuellen geschützten Member-Funktion of std::codecvt) [edit]


Inherited from std::codecvt_base

Mitglied Typ
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Member type
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Definition
enum result { ok, partial, error, noconv };
Ohne Bereichseinschränkung Aufzählungstyp
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Unscoped enumeration type
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Enumeration konstant
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Enumeration constant
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Definition
ok
Umwandlung wurde ohne Fehler beendet
Original:
conversion was completed with no error
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partial
nicht alle Quellzeichen umgewandelt wurden
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not all source characters were converted
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error
hat eine ungültige Zeichen
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encountered an invalid character
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noconv
kein Umbau erforderlich, Eingabe und Ausgabe-Typen sind die gleichen
Original:
no conversion required, input and output types are the same
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[Bearbeiten] Beispiel

Dieses Beispiel zeigt das Lesen eines GB18030-codierte Datei mit dem codecvt Facette von einem GB18030-aware locale
Original:
This example demonstrates reading a GB18030-encoded file using the codecvt facet from a GB18030-aware locale
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#include <iostream>
#include <fstream>
#include <string>
#include <locale>
int main()
{
    // GB18030 narrow multibyte encoding
    std::ofstream("text.txt") << "\x7a"              // letter 'z', U+007a
                                 "\x81\x30\x89\x38"  // letter 'ß', U+00df
                                 "\xcb\xae"          // CJK ideogram '水' (water), U+6c34
                                 "\x94\x32\xbc\x35"; // musical sign '𝄋' (segno), U+1d10b
    std::wifstream fin("text.txt");
    fin.imbue(std::locale(fin.getloc(),
              new std::codecvt_byname<wchar_t, char, std::mbstate_t>("zh_CN.gb18030")));
    for(wchar_t c; fin.get(c); )
        std::cout << std::hex << std::showbase << c << '\n';
}

Output:

0x7a
0xdf
0x6c34
0x1d10b

[Bearbeiten] Siehe auch

Konvertiten zwischen Zeichenkodierungen, inklusive UTF-8, UTF-16, UTF-32
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converts between character encodings, including UTF-8, UTF-16, UTF-32
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(Klassen-Template) [edit]