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Variantes

std::has_facet

De cppreference.com
 
 
 
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Definido en el archivo de encabezado <locale>
template< class Facet > bool has_facet( const locale& loc );
Comprueba si el loc locale implementa el Facet faceta .
Original:
Checks if the locale loc implements the facet Facet.
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Parámetros

loc -
el objeto locale consultar
Original:
the locale object to query
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Valor de retorno

Regreso true si la Facet faceta se instaló en el entorno local loc, false lo contrario .
Original:
Returns true if the facet Facet was installed in the locale loc, false otherwise.
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Excepción especificación

Especificación noexcept:  
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noexcept
  (desde C++11)

Ejemplo

#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';
}

Salida:

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

Ver también

Conjunto de facetas polimórficas que encapsulan las diferencias culturales.
(clase) [editar]
Obtiene una faceta de una configuración regional.
(plantilla de función) [editar]