include/root/RooNumber.h

0001 /*****************************************************************************
0002  * Project: RooFit                                                           *
0003  * Package: RooFitCore                                                       *
0004  *    File: $Id: RooNumber.h,v 1.7 2007/05/11 09:11:30 verkerke Exp $
0005  * Authors:                                                                  *
0006  *   WV, Wouter Verkerke, UC Santa Barbara, verkerke@slac.stanford.edu       *
0007  *   DK, David Kirkby,    UC Irvine,         dkirkby@uci.edu                 *
0008  *                                                                           *
0009  * Copyright (c) 2000-2005, Regents of the University of California          *
0010  *                          and Stanford University. All rights reserved.    *
0011  *                                                                           *
0012  * Redistribution and use in source and binary forms,                        *
0013  * with or without modification, are permitted according to the terms        *
0014  * listed in LICENSE (http://roofit.sourceforge.net/license.txt)             *
0015  *****************************************************************************/
0016 #ifndef ROO_NUMBER
0017 #define ROO_NUMBER
0018
0019 #include <limits>
0020 #include <string>
0021
0022 class RooNumber {
0023 public:
0024    /// Return internal infinity representation.
0025    constexpr static double infinity() { return std::numeric_limits<double>::infinity(); }
0026    /// Return true if x is infinite by RooNumber internal specification.
0027    constexpr static int isInfinite(double x) { return (x >= +infinity()) ? +1 : ((x <= -infinity()) ? -1 : 0); }
0028
0029    /// Set the relative epsilon that is used by range checks in RooFit,
0030    /// e.g., in RooAbsRealLValue::inRange().
0031    inline static void setRangeEpsRel(double epsRel) { staticRangeEpsRel() = epsRel; }
0032    /// Get the relative epsilon that is used by range checks in RooFit,
0033    /// e.g., in RooAbsRealLValue::inRange().
0034    inline static double rangeEpsRel() { return staticRangeEpsRel(); }
0035
0036    /// Set the absolute epsilon that is used by range checks in RooFit,
0037    /// e.g., in RooAbsRealLValue::inRange().
0038    inline static void setRangeEpsAbs(double epsRel) { staticRangeEpsAbs() = epsRel; }
0039    /// Get the absolute epsilon that is used by range checks in RooFit,
0040    /// e.g., in RooAbsRealLValue::inRange().
0041    inline static double rangeEpsAbs() { return staticRangeEpsAbs(); }
0042    static std::string toString(double x);
0043
0044 private:
0045    static double &staticRangeEpsRel();
0046    static double &staticRangeEpsAbs();
0047 };
0048
0049 #endif