SharedReference.h

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/*
 * SharedReference.h
 *
 * Copyright (C) 2011 IBR, TU Braunschweig
 *
 * Written-by: Johannes Morgenroth <morgenroth@ibr.cs.tu-bs.de>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

#ifndef SHAREDREFERENCE_H_
#define SHAREDREFERENCE_H_

#include "ibrcommon/thread/RWLock.h"
#include "ibrcommon/Exceptions.h"

namespace ibrcommon {

        template <class T>
        class SharedReference
        {
        public:
                SharedReference(T* ref, RWMutex& mutex)
                        : _item(ref), _l(mutex, RWMutex::LOCK_READONLY)
                {}

                T& operator*() const throw (ibrcommon::Exception)
                {
                        if (_item == NULL) throw ibrcommon::Exception("object not initialized");
                        return *_item;
                }

        private:
                T* _item;
                RWLock _l;
        };

} // namespace ibrcommon

#endif // SHAREDREFERENCE_H_