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