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# /home/coin/svn-release/Alps-1.4.5/CoinUtils/src/CoinFloatEqual.hpp

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    00001 /* $Id: CoinFloatEqual.hpp 1416 2011-04-17 09:57:29Z stefan $ */
    00002 // Copyright (C) 2000, International Business Machines
    00003 // Corporation and others.  All Rights Reserved.
    00004 // This code is licensed under the terms of the Eclipse Public License (EPL).
    00005
    00006 #ifndef CoinFloatEqual_H
    00007 #define CoinFloatEqual_H
    00008
    00009 #include <algorithm>
    00010 #include <cmath>
    00011
    00012 #include "CoinFinite.hpp"
    00013
    00046 class CoinAbsFltEq
    00047 {
    00048   public:
    00049
    00051
    00052   inline bool operator() (const double f1, const double f2) const
    00053
    00054   { if (CoinIsnan(f1) || CoinIsnan(f2)) return false ;
    00055     if (f1 == f2) return true ;
    00056     return (fabs(f1-f2) < epsilon_) ; }
    00057
    00060
    00066   CoinAbsFltEq () : epsilon_(1.e-10) {}
    00067
    00069
    00070   CoinAbsFltEq (const double epsilon) : epsilon_(epsilon) {}
    00071
    00073
    00074   virtual ~CoinAbsFltEq () {}
    00075
    00077
    00078   CoinAbsFltEq (const CoinAbsFltEq& src) : epsilon_(src.epsilon_) {}
    00079
    00081
    00082   CoinAbsFltEq& operator= (const CoinAbsFltEq& rhs)
    00083
    00084   { if (this != &rhs) epsilon_ = rhs.epsilon_ ;
    00085     return (*this) ; }
    00086
    00088
    00089   private:
    00090
    00093
    00095
    00096   double epsilon_ ;
    00097
    00099
    00100 } ;
    00101
    00102
    00103
    00110 class CoinRelFltEq
    00111 {
    00112   public:
    00113
    00115
    00116   inline bool operator() (const double f1, const double f2) const
    00117
    00118   { if (CoinIsnan(f1) || CoinIsnan(f2)) return false ;
    00119     if (f1 == f2) return true ;
    00120     if (!CoinFinite(f1) || !CoinFinite(f2)) return false ;
    00121
    00122     double tol = (fabs(f1)>fabs(f2))?fabs(f1):fabs(f2) ;
    00123
    00124     return (fabs(f1-f2) <= epsilon_*(1+tol)) ; }
    00125
    00128
    00129 #ifndef COIN_FLOAT
    00130
    00134   CoinRelFltEq () : epsilon_(1.e-10) {}
    00135 #else
    00136
    00140   CoinRelFltEq () : epsilon_(1.e-6) {} ; // as float
    00141 #endif
    00142
    00144
    00145   CoinRelFltEq (const double epsilon) : epsilon_(epsilon) {}
    00146
    00148
    00149   virtual ~CoinRelFltEq () {}
    00150
    00152
    00153   CoinRelFltEq (const CoinRelFltEq & src) : epsilon_(src.epsilon_) {}
    00154
    00156
    00157   CoinRelFltEq& operator= (const CoinRelFltEq& rhs)
    00158
    00159   { if (this != &rhs) epsilon_ = rhs.epsilon_ ;
    00160     return (*this) ; }
    00161
    00163
    00164 private:
    00165
    00168
    00170
    00171   double epsilon_ ;
    00172
    00174
    00175 } ;
    00176
    00177 #endif