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std::codecvt::in, std::codecvt::do_in

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< cpp‎ | locale‎ | codecvt

 
 
Lokalisierungen Bibliothek
Locales und Facetten
Original:
Locales and facets
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locale
Buchstaben-Klassifikation
Original:
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
Original:
C locale
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Defined in header <locale>
public:

result in( stateT& state,
           const externT* from,
           const externT* from_end,
           const externT*& from_next,
           internT* to,
           internT* to_end,

           internT*& to_next ) const;
(1)
protected:

result do_in( stateT& state,
              const externT* from,
              const externT* from_end,
              const externT*& from_next,
              internT* to,
              internT* to_end,

              internT*& to_next ) const;
(2)
1)
öffentliche Member-Funktion ruft die Member-Funktion do_in der am meisten abgeleiteten Klasse .
Original:
public member function, calls the member function do_in of the most derived class.
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2)
Wenn dies codecvt Facette definiert eine Umwandlung, übersetzt die externe Zeichen aus dem Quellbereich [from, from_end) auf interne Zeichen, indem die Ergebnisse in den nachfolgenden Orten ab to. Konvertiert nicht mehr als from_end - from externen Zeichen und schreibt nicht mehr als to_end - to internen Zeichen. Leaves from_next und to_next zeigt ein über das letzte Element erfolgreich konvertiert .
Original:
If this codecvt facet defines a conversion, translates the external characters from the source range [from, from_end) to internal characters, placing the results in the subsequent locations starting at to. Converts no more than from_end - from external characters and writes no more than to_end - to internal characters. Leaves from_next and to_next pointing one beyond the last element successfully converted.
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Wenn dies codecvt Facette nicht definiert eine Umwandlung, werden keine Zeichen umgewandelt. to_next eingestellt, dass sie gleich to, state unverändert ist, und std::codecvt_base::noconv zurückgegeben .
Original:
If this codecvt facet does not define a conversion, no characters are converted. to_next is set to be equal to to, state is unchanged, and std::codecvt_base::noconv is returned.
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Inhaltsverzeichnis

[Bearbeiten] Rückgabewert

Ein Wert vom Typ std::codecvt_base::result, was auf den Erfolg Status wie folgt:
Original:
A value of type std::codecvt_base::result, indicating the success status as follows:
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ok
Konvertierung abgeschlossen
Original:
conversion completed
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partial
nicht genügend Platz im Ausgabepuffer oder unerwartete Ende Quellpuffer
Original:
not enough space in the output buffer or unexpected end of source buffer
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error
begegnet ein Zeichen, das nicht konvertiert werden konnte
Original:
encountered a character that could not be converted
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noconv
diese Facette ist nicht konvertieren, keine Ausgabe geschrieben
Original:
this facet is non-converting, no output written
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Die nicht-Converting-Spezialisierung std::codecvt<char, char, std::mbstate_t> gibt immer std::codecvt_base::noconv
Original:
The non-converting specialization std::codecvt<char, char, std::mbstate_t> always returns std::codecvt_base::noconv
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[Bearbeiten] Notes

Erfordert, dass from <= from_end && to <= to_end und dass state entweder die die anfängliche Verschiebung Form oder hergestellt durch Umwandlung der vorhergehenden Zeichen in der Folge .
Original:
Requires that from <= from_end && to <= to_end and that state either representing the initial shift state or obtained by converting the preceding characters in the sequence.
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Die Wirkung auf state ist bewusst nicht spezifiziert. Im Standard-Facetten, wird es zur Verschiebung Zustand wie beim Aufruf std::mbsrtowcs halten und wird daher aktualisiert werden, um die Umwandlung Zustand nach dem zuletzt bearbeiteten externen Charakter widerspiegeln, sondern eine benutzerdefinierte Facette ist kostenlos, es zu benutzen, um andere Zustand zu halten, z. B. die Anzahl der Sonderzeichen gestoßen .
Original:
The effect on state is deliberately unspecified. In standard facets, it is used to maintain shift state like when calling std::mbsrtowcs, and is therefore updated to reflect the conversion state after the last processed external character, but a user-defined facet is free to use it to maintain any other state, e.g. count the number of special characters encountered.
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[Bearbeiten] Beispiel

#include <iostream>
#include <string>
#include <locale>
int main()
{
    std::locale::global(std::locale("en_US.utf8"));
    auto& f = std::use_facet<std::codecvt<wchar_t, char, std::mbstate_t>>(std::locale());
    std::string external = u8"z\u00df\u6c34\U0001d10b"; // or u8"zß水𝄋"
                          // or "\x7a\xc3\x9f\xe6\xb0\xb4\xf0\x9d\x84\x8b";
 
    // note that the following can be done with wstring_convert
    std::mbstate_t mb = std::mbstate_t(); // initial shift state
    std::wstring internal(external.size(), '\0'); 
    const char* from_next;
    wchar_t* to_next;
    f.in(mb, &external[0], &external[external.size()], from_next,
             &internal[0], &internal[internal.size()], to_next);
    // error checking skipped for brevity
    internal.resize(to_next - &internal[0]);
 
    std::wcout << L"The string in wide encoding: " << internal << '\n';
}

Output:

The string in wide encoding: zß水𝄋

[Bearbeiten] Siehe auch

[virtuell]
liest aus der zugehörigen Datei
Original:
reads from the associated file
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(virtuellen geschützten Member-Funktion of std::basic_filebuf) [edit]
wandelt ein Byte-String in einem breiten String
Original:
converts a byte string into a wide string
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(öffentliche Elementfunktion of std::wstring_convert) [edit]
wandelt einen schmalen Multibyte Zeichenkette breite Zeichenfolge mit dem angegebenen Zustand
Original:
converts a narrow multibyte character string to wide string, given state
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(Funktion) [edit]
[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) [edit]