has_facet.cpp

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#include <ios>        // for boolalpha 
#include <iostream>   // for cout
#include <locale>     // for ctype, has_facet(), locale
 
#include <examples.h>
 
 
// dummy facet, must derive from locale::facet
// and define a static member of type locale::id
struct MyFacet: public std::locale::facet
{
    static std::locale::id id;
};
 
std::locale::id MyFacet::id;
 
 
int main ()
{
    // create a copy of the locale imbued in cout
    const std::locale loc (std::cout.getloc ());
 
    std::cout << std::boolalpha
              << "std::has_facet<std::ctype<char> >(std::cout.getloc ()) = ";
 
    // see if ctype<char> is installed in the locale (expect true)
    std::cout << std::has_facet<std::ctype<char> >(loc) << '\n';
 
    std::cout << "std::has_facet<MyFacet>(std::cout.getloc ()) = ";
 
    // see if MyFacet is installed in the locale (expect false)
    std::cout << std::has_facet<MyFacet>(loc) << '\n';
 
    return 0;
}