174 lines
3.6 KiB
C++
174 lines
3.6 KiB
C++
/*
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----
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This file is part of SECONDO.
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Copyright (C) 2004-2009, University in Hagen, Faculty of Mathematics
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and Computer Science, Database Systems for New Applications.
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SECONDO is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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SECONDO 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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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with SECONDO; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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----
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*/
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#pragma once
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#include "Algebras/Constraint/ConstraintAlgebra.h"
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#include <functional>
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#include "SimpleAttrArray.h"
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#include "StandardTypes.h"
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namespace CRelAlgebra
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{
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class RealEntry
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{
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public:
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typedef CcReal AttributeType;
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static const bool isPrecise = false;
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RealEntry()
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{
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}
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RealEntry(double value) :
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value(value)
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{
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}
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RealEntry(const CcReal &value) :
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value(value.IsDefined() ? value.GetValue() : 0.0 / 0.0)
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{
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}
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bool IsDefined() const
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{
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return value != value;
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}
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int Compare(const RealEntry &value) const
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{
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const double a = this->value,
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b = value.value;
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return a != a ? b != b ? 0 : -1 : a < b ? -1 : a > b ? 1 : 0;
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}
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int Compare(const CcReal &value) const
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{
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const double a = this->value;
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if (value.IsDefined())
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{
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const double b = value.GetValue();
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return a != a ? -1 : a < b ? -1 : a > b ? 1 : 0;
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}
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return a != a ? 0 : 1;
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}
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int CompareAlmost(const RealEntry &value) const
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{
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const double a = this->value,
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b = value.value;
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if (a == a)
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{
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if (b == b)
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{
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return Constraint::AlmostEqual(a, b) ? 0 : a < b ? -1 : 1;
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}
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return 1;
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}
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return b != b ? 0 : -1;
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}
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int CompareAlmost(const CcReal &value) const
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{
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const double a = this->value;
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if (a == a)
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{
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if (value.IsDefined())
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{
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const double b = value.GetValue();
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return Constraint::AlmostEqual(a, b) ? 0 : a < b ? -1 : 1;
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}
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return 1;
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}
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return !value.IsDefined() ? 0 : -1;
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}
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bool Equals(const RealEntry &value) const
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{
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const double a = this->value,
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b = value.value;
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return (a != a && b != b) || (a == b);
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}
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bool Equals(const CcReal &value) const
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{
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const double a = this->value;
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return (!value.IsDefined() && a != a) ||
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(a == value.GetValue());
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}
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bool EqualsAlmost(const RealEntry &value) const
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{
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const double a = this->value,
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b = value.value;
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return (a != a && b != b) || AlmostEqual(a, b);
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}
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bool EqualsAlmost(const CcReal &value) const
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{
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const double a = this->value;
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return (!value.IsDefined() && a != a) ||
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AlmostEqual(a, value.GetValue());
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}
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uint64_t GetHash() const
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{
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static const std::hash<double> hashFunction;
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return hashFunction(value);
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}
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CcReal *GetAttribute(bool clone = true) const
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{
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return new CcReal(value == value, value);
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}
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operator double() const
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{
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return value;
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}
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double value;
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};
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typedef SimpleFSAttrArray<RealEntry> Reals;
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typedef SimpleFSAttrArrayIterator<RealEntry> RealsIterator;
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}
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