enum floating_point_comparison_type { FPC_STRONG, FPC_WEAK };

struct check_is_close_t {
#ifdef __BUG__
   template<typename FPT, typename PersentType>
#else
   typedef double  FPT;
   typedef double  PersentType;
#endif
    bool  operator()( FPT left, FPT right, PersentType percentage_tolerance, floating_point_comparison_type fpc_type = FPC_STRONG )
    {
        return ( false );
    }

};

 void test ()
 {
   check_is_close_t check_is_close;
   check_is_close ( 1.0, 1.0, 0x1p-52 );
 }