ClickHouse/base/poco/Foundation/include/Poco/AutoReleasePool.h

//
// AutoReleasePool.h
//
// Library: Foundation
// Package: Core
// Module:  AutoReleasePool
//
// Definition of the AutoReleasePool class.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier:	BSL-1.0
//


#ifndef Foundation_AutoReleasePool_INCLUDED
#define Foundation_AutoReleasePool_INCLUDED


#include <list>
#include "Poco/Foundation.h"


namespace Poco
{


template <class C>
class AutoReleasePool
/// An AutoReleasePool implements simple garbage collection for
/// reference-counted objects.
/// It temporarily takes ownership of reference-counted objects that
/// nobody else wants to take ownership of and releases them
/// at a later, appropriate point in time.
///
/// Note: The correct way to add an object hold by an AutoPtr<> to
/// an AutoReleasePool is by invoking the AutoPtr's duplicate()
/// method. Example:
///    AutoReleasePool<C> arp;
///    AutoPtr<C> ptr = new C;
///    ...
///    arp.add(ptr.duplicate());
{
public:
    AutoReleasePool()
    /// Creates the AutoReleasePool.
    {
    }

    ~AutoReleasePool()
    /// Destroys the AutoReleasePool and releases
    /// all objects it currently holds.
    {
        release();
    }

    void add(C * pObject)
    /// Adds the given object to the AutoReleasePool.
    /// The object's reference count is not modified
    {
        if (pObject)
            _list.push_back(pObject);
    }

    void release()
    /// Releases all objects the AutoReleasePool currently holds
    /// by calling each object's release() method.
    {
        while (!_list.empty())
        {
            _list.front()->release();
            _list.pop_front();
        }
    }

private:
    typedef std::list<C *> ObjectList;

    ObjectList _list;
};


} // namespace Poco


#endif // Foundation_AutoReleasePool_INCLUDED