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Varianti

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

Da cppreference.com.
< cpp‎ | locale‎ | codecvt

 
 
Localizzazioni libreria
Impostazioni internazionali e sfaccettature
Original:
Locales and facets
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locale
Carattere classificazione
Original:
Character classification
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Conversioni
Original:
Conversions
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Facet categoria classi di base
Original:
Facet category base classes
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Facet categorie
Original:
Facet categories
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Locale specifici aspetti
Original:
Locale-specific facets
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Codice di conversione sfaccettature
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)
funzione membro pubblica, chiama la do_always_noconv funzione membro della classe più derivata.
Original:
public member function, calls the member function do_always_noconv of the most derived class.
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2)
torna true se sia do_in() e do_out() ritorno std::codecvt_base::noconv per tutti gli ingressi validi.
Original:
returns true if both do_in() and do_out() return std::codecvt_base::noconv for all valid inputs.
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Indice

[modifica] Valore di ritorno

true se questo aspetto di conversione esegue nessuna conversione, false altrimenti.
Original:
true if this conversion facet performs no conversions, false otherwise.
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La mancata conversione di specializzazione std::codecvt<char, char, std::mbstate_t> rendimenti true
Original:
The non-converting specialization std::codecvt<char, char, std::mbstate_t> returns true
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[modifica] Note

Questa funzione può essere utilizzata ad esempio per l'attuazione di std::basic_filebuf::underflow di utilizzare la copia bulk carattere invece di chiamare std::codecvt::in se è noto che il locale imbevuto nel std::basic_filebuf non esegue alcuna conversione.
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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[modifica] Eccezioni

noexcept specification:  
noexcept
  (dal C++11)

[modifica] Esempio

#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