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    std::codecvt::always_noconv, std::codecvt::do_always_noconv

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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
    Original:
    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
    Original:
    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: bool always_noconv() const
    		 (1)
    protected: bool do_max_length() const
    		 (2)

    1)

    öffentliche Member-Funktion ruft die Member-Funktion do_always_noconv der am meisten abgeleiteten Klasse .
    Original:
    public member function, calls the member function do_always_noconv of the most derived class.
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    2)

    kehrt true wenn beide do_in() und do_out() Rückkehr std::codecvt_base::noconv für alle gültigen Eingaben .
    Original:
    returns true if both do_in() and do_out() return std::codecvt_base::noconv for all valid inputs.
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    Rückgabewert

    true, wenn diese Umwandlung Facette führt keine Umbauten, false sonst .
    Original:
    true if this conversion facet performs no conversions, false otherwise.
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    Die nicht-Converting-Spezialisierung std::codecvt<char, char, std::mbstate_t> kehrt true
    Original:
    The non-converting specialization std::codecvt<char, char, std::mbstate_t> returns true
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    Notes

    Diese Funktion kann z. B. bei der Umsetzung der std::basic_filebuf::underflow verwendet werden, um lose Charakter copy anstelle von Aufrufen std::codecvt::in wenn bekannt ist, dass die Länderkennung in der std::basic_filebuf durchdrungen führt keine Umbauten .
    Original:
    This function may be used e.g. in the implementation of std::basic_filebuf::underflow to use bulk character copy instead of calling std::codecvt::in if it is known that the locale imbued in the std::basic_filebuf does not perform any conversions.
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    Ausnahmen

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

    Beispiel

    #include <locale>
#include <iostream>
int main()
{
    std::cout << "The non-converting char<->char codecvt::always_noconv() returns " 
              << std::boolalpha
              << std::use_facet<std::codecvt<char, char, std::mbstate_t>>(
                    std::locale()
                 ).always_noconv() << "\n"
              << "while wchar_t<->char codecvt::always_noconv() returns "
              << std::use_facet<std::codecvt<wchar_t, char, std::mbstate_t>>(
                    std::locale()
                 ).always_noconv() << "\n";

}

    Output: 

    The non-converting char<->char codecvt::always_noconv() returns true
while wchar_t<->char codecvt::always_noconv() returns false