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authorHarpreet2016-09-03 00:36:51 +0530
committerHarpreet2016-09-03 00:36:51 +0530
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tree1a1955c5482ae608fd7f618b06f4ecc6a0d39a23 /newstructure/thirdparty/linux/include/coin/CoinFloatEqual.hpp
parent4b64cf486f5c999fd8167758cae27839f3b50848 (diff)
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diff --git a/newstructure/thirdparty/linux/include/coin/CoinFloatEqual.hpp b/newstructure/thirdparty/linux/include/coin/CoinFloatEqual.hpp
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-/* $Id: CoinFloatEqual.hpp 1416 2011-04-17 09:57:29Z stefan $ */
-// Copyright (C) 2000, International Business Machines
-// Corporation and others. All Rights Reserved.
-// This code is licensed under the terms of the Eclipse Public License (EPL).
-
-#ifndef CoinFloatEqual_H
-#define CoinFloatEqual_H
-
-#include <algorithm>
-#include <cmath>
-
-#include "CoinFinite.hpp"
-
-/*! \file CoinFloatEqual.hpp
- \brief Function objects for testing equality of real numbers.
-
- Two objects are provided; one tests for equality to an absolute tolerance,
- one to a scaled tolerance. The tests will handle IEEE floating point, but
- note that infinity == infinity. Mathematicians are rolling in their graves,
- but this matches the behaviour for the common practice of using
- <code>DBL_MAX</code> (<code>numeric_limits<double>::max()</code>, or similar
- large finite number) as infinity.
-
- <p>
- Example usage:
- @verbatim
- double d1 = 3.14159 ;
- double d2 = d1 ;
- double d3 = d1+.0001 ;
-
- CoinAbsFltEq eq1 ;
- CoinAbsFltEq eq2(.001) ;
-
- assert( eq1(d1,d2) ) ;
- assert( !eq1(d1,d3) ) ;
- assert( eq2(d1,d3) ) ;
- @endverbatim
- CoinRelFltEq follows the same pattern. */
-
-/*! \brief Equality to an absolute tolerance
-
- Operands are considered equal if their difference is within an epsilon ;
- the test does not consider the relative magnitude of the operands.
-*/
-
-class CoinAbsFltEq
-{
- public:
-
- //! Compare function
-
- inline bool operator() (const double f1, const double f2) const
-
- { if (CoinIsnan(f1) || CoinIsnan(f2)) return false ;
- if (f1 == f2) return true ;
- return (fabs(f1-f2) < epsilon_) ; }
-
- /*! \name Constructors and destructors */
- //@{
-
- /*! \brief Default constructor
-
- Default tolerance is 1.0e-10.
- */
-
- CoinAbsFltEq () : epsilon_(1.e-10) {}
-
- //! Alternate constructor with epsilon as a parameter
-
- CoinAbsFltEq (const double epsilon) : epsilon_(epsilon) {}
-
- //! Destructor
-
- virtual ~CoinAbsFltEq () {}
-
- //! Copy constructor
-
- CoinAbsFltEq (const CoinAbsFltEq& src) : epsilon_(src.epsilon_) {}
-
- //! Assignment
-
- CoinAbsFltEq& operator= (const CoinAbsFltEq& rhs)
-
- { if (this != &rhs) epsilon_ = rhs.epsilon_ ;
- return (*this) ; }
-
- //@}
-
- private:
-
- /*! \name Private member data */
- //@{
-
- //! Equality tolerance.
-
- double epsilon_ ;
-
- //@}
-
-} ;
-
-
-
-/*! \brief Equality to a scaled tolerance
-
- Operands are considered equal if their difference is within a scaled
- epsilon calculated as epsilon_*(1+CoinMax(|f1|,|f2|)).
-*/
-
-class CoinRelFltEq
-{
- public:
-
- //! Compare function
-
- inline bool operator() (const double f1, const double f2) const
-
- { if (CoinIsnan(f1) || CoinIsnan(f2)) return false ;
- if (f1 == f2) return true ;
- if (!CoinFinite(f1) || !CoinFinite(f2)) return false ;
-
- double tol = (fabs(f1)>fabs(f2))?fabs(f1):fabs(f2) ;
-
- return (fabs(f1-f2) <= epsilon_*(1+tol)) ; }
-
- /*! \name Constructors and destructors */
- //@{
-
-#ifndef COIN_FLOAT
- /*! Default constructor
-
- Default tolerance is 1.0e-10.
- */
- CoinRelFltEq () : epsilon_(1.e-10) {}
-#else
- /*! Default constructor
-
- Default tolerance is 1.0e-6.
- */
- CoinRelFltEq () : epsilon_(1.e-6) {} ; // as float
-#endif
-
- //! Alternate constructor with epsilon as a parameter
-
- CoinRelFltEq (const double epsilon) : epsilon_(epsilon) {}
-
- //! Destructor
-
- virtual ~CoinRelFltEq () {}
-
- //! Copy constructor
-
- CoinRelFltEq (const CoinRelFltEq & src) : epsilon_(src.epsilon_) {}
-
- //! Assignment
-
- CoinRelFltEq& operator= (const CoinRelFltEq& rhs)
-
- { if (this != &rhs) epsilon_ = rhs.epsilon_ ;
- return (*this) ; }
-
- //@}
-
-private:
-
- /*! \name Private member data */
- //@{
-
- //! Base equality tolerance
-
- double epsilon_ ;
-
- //@}
-
-} ;
-
-#endif