Varianti

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

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    <metanoindex/>

     
    C++
     
    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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    std::codecvt
     
    <tbody> </tbody>
    Elemento definito nell'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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    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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    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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    Eccezioni

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

    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