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

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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
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
Original:
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
Original:
C locale
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Defined 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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Inhaltsverzeichnis

[Bearbeiten] 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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[Bearbeiten] 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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[Bearbeiten] Ausnahmen

noexcept specification:  
noexcept
  (seit C++11)

[Bearbeiten] 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