Standard C++ Library
Copyright 1998, Rogue Wave Software, Inc.

NAME

 
has_facet
 
 - A function template used to determine if a locale has a given facet.
 
 
 

SYNOPSIS

 
 
#include <locale>
template <class Facet> bool has_facet(const locale&) throw();
 
 
 

DESCRIPTION

 
 
has_facet returns true if the requested facet is available in the locale. Otherwise it returns false.   You specify the facet type by explicitly including the template parameter (see the example below). 
 
Note that if your compiler cannot overload function templates on return type, then you need to use an alternative_has_facet template. The alternative template takes an additional argument that’s a pointer to the type of facet you want to check on. The declaration looks like this:
 
 
template <class Facet>
const bool has_facet(const locale&, Facet∗) throw();
 
The example below shows the use of both variations of has_facet.
 
 
 

EXAMPLE

 
 
 
//
// hasfacet.cpp
//
 
#include <iostream>
 
int main ()
{

using namespace std;

locale loc;

 
#ifndef _RWSTD_NO_TEMPLATE_ON_RETURN_TYPE

cout << has_facet<ctype<char> >(loc) << endl;

#else

cout << has_facet(loc,(ctype<char>∗)0) << endl;

#endif

 
return 0;

}
 
 
 

SEE ALSO

 
 
locale, facets, use_facet
 

Rogue Wave Software  —  Last change: 02 Apr 1998