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std::has_facet

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< cpp‎ | locale

 
 
Biblioteca localizações
Localidades e facetas
Original:
Locales and facets
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locale
has_facet
Classificação de caracteres
Original:
Character classification
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Conversões
Original:
Conversions
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Facet classes base da categoria
Original:
Facet category base classes
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Categorias faceta
Original:
Facet categories
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Específicos da localidade facetas
Original:
Locale-specific facets
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Facetas de conversão de código
Original:
Code conversion facets
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codecvt_utf8(C++11)
codecvt_utf16(C++11)
C localidade
Original:
C locale
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Defined in header <locale>
template< class Facet >
bool has_facet( const locale& loc );
Verifica se o loc local implementa o Facet faceta.
Original:
Checks if the locale loc implements the facet Facet.
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Índice

[editar] Parâmetros

loc -
o objeto de localidade para consultar
Original:
the locale object to query
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[editar] Valor de retorno

Retorna true se o Facet faceta foi instalado na localidade loc, false outra forma.
Original:
Returns true if the facet Facet was installed in the locale loc, false otherwise.
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[editar] Especificação de exceção

noexcept specification:  
noexcept
  (a partir do C++ 11)

[editar] Exemplo

#include <iostream>
#include <locale>
// minimal custom facet
struct myfacet : public std::locale::facet {
    static std::locale::id id;
};
std::locale::id myfacet::id;
int main()
{
    // loc is a "C" locale with myfacet added
    std::locale loc(std::locale::classic(), new myfacet);
    std::cout << std::boolalpha
              << "Can loc classify chars? "
              << std::has_facet<std::ctype<char>>(loc) << '\n'
              << "Can loc classify char32_t? "
              << std::has_facet<std::ctype<char32_t>>(loc) << '\n'
              << "Does loc implement myfacet? "
              << std::has_facet<myfacet>(loc) << '\n';
}

Output:

Can loc classify chars? true
Can loc classify char32_t? false
Does loc implement myfacet? true

[editar] Veja também

conjunto de facetas polimórficos que encapsulam as diferenças culturais
Original:
set of polymorphic facets that encapsulate cultural differences
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(classe) [edit]
obtém uma faceta de uma localidade
Original:
obtains a facet from a locale
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(modelo de função) [edit]