guard.h

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// OSB library ********************************************* -*- C++ -*-
/*
  AUTHOR(S): Stephan Broennimann (vb)

  RCS information
   $Name: OSB_060808 $
   $Revision: 1.13 $

  License
   OSB rating and billing library for communication networks
   Copyright (C) 2004, 2005, 2006  OSB systems

   This file may be distributed and/or modify under the terms of the
   GNU General Public License (GPL) as published by the Free Software
   Foundation which is provided in the file LICENSE.GPL included in the
   packaging of this file.

   The file is distributed in the hope that it will be useful, but WITHOUT
   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   for more details.

   Holders of a OSB Commercial License may use this file under the terms
   and conditions of this commercial license.
 */
#ifndef _GUARD_H_
#define _GUARD_H_

// *********************************************************************
// included header files
// + standard includes
#include <memory>
#include <utility>

// + local headers

// *********************************************************************
// namespace extensions
namespace OSB_LIB {

// *********************************************************************
// class definitions

    // *****************************************************************
    // class Guard
    class Guard {
    private:
        struct GuardRef {
            Guard& s;
            GuardRef(Guard& r) : s(r) {}
        };

    public:
        class Cleanup {
        public:
            typedef std::auto_ptr<Guard::Cleanup> AutoPtr;

            virtual ~Cleanup();
            virtual int cleanup() = 0;
        };

        Guard(
            Cleanup* pCleanup = 0,
            bool     doClean  = true
        );

        Guard(
            Cleanup::AutoPtr cleanup,
            bool             doClean
        );

        ~Guard();

        Guard(Guard& rhs);

        Guard& operator=(Guard rhs);

        Guard(GuardRef r);

        operator GuardRef();

        bool isLoaded() const  { return doClean_; }

        std::pair<bool, int> cleanup();

        bool release();
    private:
        bool     doClean_;
        Cleanup* pCleanup_;
        bool     delCleanup_;
    };                                  // class Guard
}                                       // namespace OSB_LIB
#endif                                  // #ifndef _GUARD_H_

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