63 lines
1.7 KiB
C++
63 lines
1.7 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2005 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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//osgIntrospection - Copyright (C) 2005 Marco Jez
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#ifndef OSGINTROSPECTION_COMPARATOR_
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#define OSGINTROSPECTION_COMPARATOR_
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namespace osgIntrospection
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{
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class Value;
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struct Comparator
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{
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virtual bool isEqualTo(const Value& l, const Value& r) const = 0;
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virtual bool isLessThanOrEqualTo(const Value& l, const Value& r) const = 0;
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};
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template<typename T>
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struct TotalOrderComparator: Comparator
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{
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virtual bool isEqualTo(const Value& l, const Value& r) const
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{
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const T &vl = variant_cast<const T &>(l);
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const T &vr = variant_cast<const T &>(r);
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return vl <= vr && vr <= vl;
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}
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virtual bool isLessThanOrEqualTo(const Value& l, const Value& r) const
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{
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return variant_cast<const T &>(l) <= variant_cast<const T &>(r);
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}
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};
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template<typename T>
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struct PartialOrderComparator: Comparator
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{
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virtual bool isEqualTo(const Value& l, const Value& r) const
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{
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return variant_cast<const T &>(l) == variant_cast<const T &>(r);
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}
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virtual bool isLessThanOrEqualTo(const Value& , const Value& ) const
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{
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throw ComparisonOperatorNotSupportedException(typeid(T), "less than or equal to");
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}
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};
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}
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#endif
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