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

    De cppreference.com

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    <metanoindex/>

     
    C++
     
    Bibliothèque localisations
    Locales et facettes
    Original:
    Locales and facets
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    locale
    Classification des caractères
    Original:
    Character classification
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    Conversions
    Original:
    Conversions
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    Classes de facettes catégorie de base
    Original:
    Facet category base classes
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    Catégories de facettes
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    Facet categories
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    Spécifique aux paramètres régionaux facettes
    Original:
    Locale-specific facets
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    Facettes de conversion de code
    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>
    Déclaré dans l'en-tête <locale>
    public: bool always_noconv() const
    		 (1)
    protected: bool do_max_length() const
    		 (2)

    1)

    fonction de membre du public, appelle le do_always_noconv fonction membre de la classe la plus dérivée .
    Original:
    public member function, calls the member function do_always_noconv of the most derived class.
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    2)

    true rendements si les deux do_in() et do_out() retour std::codecvt_base::noconv pour toutes les entrées valides .
    Original:
    returns true if both do_in() and do_out() return std::codecvt_base::noconv for all valid inputs.
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    Retourne la valeur

    true si cette facette de conversion effectue pas de conversions, false autrement .
    Original:
    true if this conversion facet performs no conversions, false otherwise.
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    La spécialisation non-conversion std::codecvt<char, char, std::mbstate_t> retours true
    Original:
    The non-converting specialization std::codecvt<char, char, std::mbstate_t> returns true
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    Notes

    Cette fonction peut être utilisée par exemple dans la mise en œuvre de std::basic_filebuf::underflow d'utiliser de copie de personnages en vrac au lieu d'appeler std::codecvt::in si l'on sait que les paramètres régionaux imprégnée dans le std::basic_filebuf n'effectue pas de conversion .
    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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    Exceptions

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

    Exemple

    #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";

}

    Résultat : 

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