XCHANGEHANDLE.h

Go to the documentation of this file.

/*  XCHANGEHANDLE.h - Wrapper for FindFirstChangeNotification handles
    Copyright (C) 2001-2004 Mark Weaver
    Written by Mark Weaver <mark@npsl.co.uk>

    Part of the Open-Win32 library.
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library 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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the
    Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    Boston, MA  02111-1307, USA.
*/

#ifndef OW32_XCHANGEHANDLE_H
#define OW32_XCHANGEHANDLE_H

#include <OW32/OW32Libs.h>
#include <OW32/windows.h>

namespace OW32
{

class OW32_LIB_EXPORT XCHANGEHANDLE 
{
private:
   HANDLE m_HANDLE;

   XCHANGEHANDLE(const XCHANGEHANDLE& );
   XCHANGEHANDLE& operator=(const XCHANGEHANDLE& );

public:
    XCHANGEHANDLE() : m_HANDLE(INVALID_HANDLE_VALUE) {} 

    XCHANGEHANDLE(HANDLE h) : m_HANDLE(h) { }

    ~XCHANGEHANDLE() {
        Close();
    }

    void Close() {
        if (m_HANDLE != INVALID_HANDLE_VALUE && m_HANDLE != NULL) {
            FindCloseChangeNotification(m_HANDLE);
            m_HANDLE = INVALID_HANDLE_VALUE;
        }
    }

    operator HANDLE() const { return m_HANDLE; }

    HANDLE* operator&() { return &m_HANDLE; }

    HANDLE operator=(HANDLE h) { Close(); m_HANDLE = h; return m_HANDLE; }

    HANDLE Detach() { HANDLE h = m_HANDLE; m_HANDLE = NULL; return h; }
};

};

#endif // OW32_XCHANGEHANDLE_H

---