greenplumn CCost 源码
greenplumn CCost 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/cost/CCost.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CCost.h
//
// @doc:
// Cost type
//---------------------------------------------------------------------------
#ifndef GPNAUCRATES_CCost_H
#define GPNAUCRATES_CCost_H
#include "gpos/base.h"
#include "gpos/common/CDouble.h"
#include "gpos/common/CDynamicPtrArray.h"
namespace gpopt
{
using namespace gpos;
class CCost;
using CCostArray = CDynamicPtrArray<CCost, CleanupDelete>;
//---------------------------------------------------------------------------
// @class:
// CCost
//
// @doc:
// Cost for comparing two plans
//
//---------------------------------------------------------------------------
class CCost : public CDouble
{
public:
// ctor
explicit CCost(DOUBLE d) : CDouble(d)
{
}
// ctor
explicit CCost(CDouble d) : CDouble(d.Get())
{
}
// ctor
CCost(const CCost &cost) : CDouble(cost.Get())
{
}
// assignment
CCost &
operator=(const CCost &cost)
{
*(CDouble *) (this) = (CDouble) cost;
return (*this);
}
// addition operator
CCost
operator+(const CCost &cost) const
{
CDouble d = (CDouble)(*this) + (CDouble) cost;
return CCost(d);
}
// multiplication operator
CCost
operator*(const CCost &cost) const
{
return CCost((CDouble)(*this) * (CDouble) cost);
}
// comparison operator
BOOL
operator<(const CCost &cost) const
{
return (CDouble)(*this) < (CDouble) cost;
}
// comparison operator
BOOL
operator>(const CCost &cost) const
{
return (CDouble) cost < (CDouble)(*this);
}
// d'tor
virtual ~CCost() = default;
}; // class CCost
} // namespace gpopt
#endif // !GPNAUCRATES_CCost_H
// EOF
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