RooNumber.cxx

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/*****************************************************************************
 * Project: RooFit                                                           *
 * Package: RooFitCore                                                       *
 * @(#)root/roofitcore:$Id$
 * Authors:                                                                  *
 *   WV, Wouter Verkerke, UC Santa Barbara, verkerke@slac.stanford.edu       *
 *   DK, David Kirkby,    UC Irvine,         dkirkby@uci.edu                 *
 *                                                                           *
 * Copyright (c) 2000-2005, Regents of the University of California          *
 *                          and Stanford University. All rights reserved.    *
 *                                                                           *
 * Redistribution and use in source and binary forms,                        *
 * with or without modification, are permitted according to the terms        *
 * listed in LICENSE (http://roofit.sourceforge.net/license.txt)             *
 *****************************************************************************/
 
/**
\file RooNumber.cxx
\class RooNumber
\ingroup Roofitcore
 
Class RooNumber implements numeric constants used by RooFit
**/
 
#include "RooNumber.h"
 
using namespace std;
 
ClassImp(RooNumber);
;
 
#ifdef HAS_NUMERIC_LIMITS
 
#include <numeric_limits.h>
double RooNumber::_Infinity= numeric_limits<double>::infinity();
#else
 
// This assumes a well behaved IEEE-754 floating point implementation.
// The next line may generate a compiler warning that can be ignored.
double RooNumber::_Infinity= 1.0e30 ;  //1./0.;
 
#endif
 
 
////////////////////////////////////////////////////////////////////////////////
/// Return internal infinity representation
 
double RooNumber::infinity()
{
  return _Infinity ;
}
 
 
////////////////////////////////////////////////////////////////////////////////
/// Return true if x is infinite by RooNumBer internal specification
 
Int_t RooNumber::isInfinite(double x)
{
  return (x >= +_Infinity) ? +1 : ((x <= -_Infinity) ? -1 : 0);
}