use_facet

Article
07/29/2015

Returns a reference to a facet of a specified type stored in a locale.

template<class Facet> 
   const Facet& use_facet( 
      const locale& _Loc 
   );

Parameters

_Loc
The const locale containing the type of facet being referenced.

Return Value

A reference to the facet of class Facet contained within the argument locale.

Remarks

The reference to the facet returned by the template function remains valid as long as any copy of the containing locale exists. If no such facet object of class Facet is listed in the argument locale, the function throws a bad_cast exception.

Example

// locale_use_facet.cpp
// compile with: /EHsc
#include <locale>
#include <iostream>
using namespace std;

int main( )   
{
   locale loc1 ( "German_Germany" ), loc2 ( "English_Australia" );
   bool result1 = use_facet<ctype<char> > ( loc1 ).is(
   ctype_base::alpha, 'a' 
);
   bool result2 = use_facet<ctype<char> > ( loc2 ).is( ctype_base::alpha, '!'
   );

   if ( result1 )
      cout << "The character 'a' in locale loc1 is alphabetic." 
           << endl;
   else
      cout << "The character 'a' in locale loc1 is not alphabetic." 
           << endl;

   if ( result2 )
      cout << "The character '!' in locale loc2 is alphabetic." 
           << endl;
   else
      cout << "The character '!' in locale loc2 is not alphabetic." 
           << endl;
}

The character 'a' in locale loc1 is alphabetic.
The character '!' in locale loc2 is not alphabetic.

Requirements

Header: <locale>

Namespace: std

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