49 lines
1.1 KiB
Plaintext
49 lines
1.1 KiB
Plaintext
#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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