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RooNumber.cxx
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1 /*****************************************************************************
2  * Project: RooFit *
3  * Package: RooFitCore *
4  * @(#)root/roofitcore:$Id$
5  * Authors: *
6  * WV, Wouter Verkerke, UC Santa Barbara, verkerke@slac.stanford.edu *
7  * DK, David Kirkby, UC Irvine, dkirkby@uci.edu *
8  * *
9  * Copyright (c) 2000-2005, Regents of the University of California *
10  * and Stanford University. All rights reserved. *
11  * *
12  * Redistribution and use in source and binary forms, *
13  * with or without modification, are permitted according to the terms *
14  * listed in LICENSE (http://roofit.sourceforge.net/license.txt) *
15  *****************************************************************************/
16 
17 /**
18 \file RooNumber.cxx
19 \class RooNumber
20 \ingroup Roofitcore
21 
22 Class RooNumber implements numeric constants used by RooFit
23 **/
24 
25 #include "RooFit.h"
26 #include "RooNumber.h"
27 
28 using namespace std;
29 
31 ;
32 
33 #ifdef HAS_NUMERIC_LIMITS
34 
35 #include <numeric_limits.h>
36 Double_t RooNumber::_Infinity= numeric_limits<Double_t>::infinity();
37 #else
38 
39 // This assumes a well behaved IEEE-754 floating point implementation.
40 // The next line may generate a compiler warning that can be ignored.
41 Double_t RooNumber::_Infinity= 1.0e30 ; //1./0.;
42 
43 #endif
44 
45 
46 ////////////////////////////////////////////////////////////////////////////////
47 /// Return internal infinity representation
48 
50 {
51  return _Infinity ;
52 }
53 
54 
55 ////////////////////////////////////////////////////////////////////////////////
56 /// Return true if x is infinite by RooNumBer internal specification
57 
59 {
60  return (x >= +_Infinity) ? +1 : ((x <= -_Infinity) ? -1 : 0);
61 }
62 
Class RooNumber implements numeric constants used by RooFit.
Definition: RooNumber.h:21
static Int_t isInfinite(Double_t x)
Return true if x is infinite by RooNumBer internal specification.
Definition: RooNumber.cxx:58
STL namespace.
Double_t x[n]
Definition: legend1.C:17
static Double_t infinity()
Return internal infinity representation.
Definition: RooNumber.cxx:49
#define ClassImp(name)
Definition: Rtypes.h:361
double Double_t
Definition: RtypesCore.h:57
static Double_t _Infinity
Definition: RooNumber.h:30