std::codecvt::encoding, std::codecvt::do_encoding – cppreference.com

std::codecvt::encoding, std::codecvt::do_encoding

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<metanoindex/>

 
C++
 
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
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C locale
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std::codecvt
 
<tbody> </tbody>
definiert in Header <locale>
public: int encoding() const
 (1)
protected: int do_encoding() const
 (2)

1)

öffentliche Member-Funktion ruft die Member-Funktion do_encoding der am meisten abgeleiteten Klasse .
Original:
public member function, calls the member function do_encoding of the most derived class.
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2) if the encoding represented by this codecvt facet maps each internal character to the same, constant number of external characters, returns that number. If the encoding is variable-length (e.g. UTF-8 or UTF-16), returns 0. If the encoding is state-dependent, returns -1.

Rückgabewert

The exact number of externT characters that correspond to one internT character, if constant. 0 if the number varies, -1 if the encoding is state-dependent.

Die nicht-Converting-Spezialisierung std::codecvt<char, char, std::mbstate_t> kehrt 1
Original:
The non-converting specialization std::codecvt<char, char, std::mbstate_t> returns 1
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Ausnahmen

noexcept specification:  
<tbody> </tbody>
noexcept
  (seit C++11)

Beispiel

#include <locale>
#include <iostream>
int main()
{
    std::cout << "en_US.utf8 is a variable-length encoding, encoding() returns "
              << std::use_facet<std::codecvt<wchar_t, char, std::mbstate_t>>(
                    std::locale("en_US.utf8")
              ).encoding() << '\n';

    std::cout << "zh_CN.gb18030 is also variable-length, encoding() == "
              << std::use_facet<std::codecvt<wchar_t, char, std::mbstate_t>>(
                    std::locale("zh_CN.gb18030")
              ).encoding() << '\n';

    std::cout << "ru_RU.koi8r is a single-byte encoding encoding() == "
              << std::use_facet<std::codecvt<wchar_t, char, std::mbstate_t>>(
                    std::locale("ru_RU.koi8r")
              ).encoding() << '\n';
}

Output: 

en_US.utf8 is a variable-length encoding, encoding() returns 0
zh_CN.gb18030 is also variable-length, encoding() == 0
ru_RU.koi8r is a single-byte encoding encoding() == 1

Siehe auch