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973c2be1e1
The copying permission statements at the beginning of source files updated to refer to LGPL. Copyright dates extended till 2014 in advance.
80 lines
2.5 KiB
C++
80 lines
2.5 KiB
C++
// Created on: 2011-01-27
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// Created by: KGV
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// Copyright (c) 2011-2014 OPEN CASCADE SAS
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//
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// This file is part of Open CASCADE Technology software library.
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//
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// This library is free software; you can redistribute it and / or modify it
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// under the terms of the GNU Lesser General Public version 2.1 as published
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// by the Free Software Foundation, with special exception defined in the file
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// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
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// distribution for complete text of the license and disclaimer of any warranty.
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//
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// Alternatively, this file may be used under the terms of Open CASCADE
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// commercial license or contractual agreement.
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#ifndef _NCollection_Comparator_HeaderFile
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#define _NCollection_Comparator_HeaderFile
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#include <Precision.hxx>
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/**
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* Class to define basic compare operations.
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* Basic implementation use redirection to standard C++ operators.
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* You can use standard C++ templates mechanisms to redefine these methods
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* or to inherit basic implementation to create multiple comparators
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* for same type with different rules.
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*/
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template<class TheItemType>
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class NCollection_Comparator
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{
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public:
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NCollection_Comparator (const Standard_Real theTolerance = Precision::Confusion())
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: myTolerance (theTolerance) {}
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virtual ~NCollection_Comparator() {}
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public:
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//! Comparison functions which should be overridden
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//! if standard operators are not defined for user type.
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//! Should return true if Left value is greater than Right
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virtual Standard_Boolean IsGreater (const TheItemType& theLeft, const TheItemType& theRight) const
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{
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return theLeft > theRight;
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}
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//! Should return true if values are equal
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virtual Standard_Boolean IsEqual (const TheItemType& theLeft, const TheItemType& theRight) const
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{
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return theLeft == theRight;
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}
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public:
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//! Comparison functions which may be overridden for performance reasons
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//! Should return true if Left value is lower than Right
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virtual Standard_Boolean IsLower (const TheItemType& theLeft, const TheItemType& theRight) const
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{
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return !IsGreater (theLeft, theRight) && !IsEqual (theLeft, theRight);
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}
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virtual Standard_Boolean IsLowerEqual (const TheItemType& theLeft, const TheItemType& theRight) const
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{
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return !IsGreater (theLeft, theRight);
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}
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virtual Standard_Boolean IsGreaterEqual (const TheItemType& theLeft, const TheItemType& theRight) const
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{
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return IsGreater (theLeft, theRight) || IsEqual (theLeft, theRight);
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}
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protected:
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Standard_Real myTolerance;
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};
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#endif /*_NCollection_Comparator_HeaderFile*/
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