greenplumn CAutoP 源码
greenplumn CAutoP 代码
文件路径：/src/backend/gporca/libgpos/include/gpos/common/CAutoP.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2008 Greenplum, Inc.
//
// @filename:
// CAutoP.h
//
// @doc:
// Basic auto pointer implementation; do not anticipate ownership based
// on assignment to other auto pointers etc. Require explicit return/assignment
// to re-init the object;
//
// This is primarily used for auto destruction.
// Not using Boost's auto pointer logic to discourage blurring ownership
// of objects.
//---------------------------------------------------------------------------
#ifndef GPOS_CAutoP_H
#define GPOS_CAutoP_H
#include "gpos/base.h"
#include "gpos/common/CStackObject.h"
namespace gpos
{
//---------------------------------------------------------------------------
// @class:
// CAutoP
//
// @doc:
// Wrapps pointer of type T; overloads *, ->, = does not provide
// copy ctor;
//
//---------------------------------------------------------------------------
template <class T>
class CAutoP : public CStackObject
{
protected:
// actual element to point to
T *m_object;
public:
CAutoP<T>(const CAutoP &) = delete;
// ctor
explicit CAutoP<T>() : m_object(nullptr)
{
}
explicit CAutoP<T>(T *object) : m_object(object)
{
}
// dtor
virtual ~CAutoP();
// simple assignment
CAutoP<T> const &
operator=(T *object)
{
m_object = object;
return *this;
}
// deref operator
T &
operator*()
{
GPOS_ASSERT(nullptr != m_object);
return *m_object;
}
// returns only base pointer, compiler does appropriate deref'ing
T *
operator->()
{
return m_object;
}
// return basic pointer
T *
Value()
{
return m_object;
}
// unhook pointer from auto object
T *
Reset()
{
T *object = m_object;
m_object = nullptr;
return object;
}
}; // class CAutoP
//---------------------------------------------------------------------------
// @function:
// CAutoP::~CAutoP
//
// @doc:
// Dtor
//
//---------------------------------------------------------------------------
template <class T>
CAutoP<T>::~CAutoP()
{
GPOS_DELETE(m_object);
}
} // namespace gpos
#endif // !GPOS_CAutoP_H
// EOF
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