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#ifndef QPID_BOUNDEDITERATOR_H
#define QPID_BOUNDEDITERATOR_H
/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*
*/
#include <boost/iterator/iterator_adaptor.hpp>
#include "qpid/Exception.h"
namespace qpid {
struct OutOfBoundsException : public Exception {};
/**
* Iterator wrapper that throws an exception if iterated beyound the bounds.
*/
template <class Iter>
class BoundedIterator :
public boost::iterator_adaptor<BoundedIterator<Iter>, Iter>
{
public:
BoundedIterator(const Iter& begin, const Iter& end_) :
BoundedIterator::iterator_adaptor_(begin), end(end_) {}
operator Iter() const { return this->base_reference(); }
private:
typename boost::iterator_reference<Iter>::type dereference() const {
if (this->base_reference() == end) throw OutOfBoundsException();
return *(this->base_reference());
}
void increment() {
if (this->base_reference() == end) throw OutOfBoundsException();
++this->base_reference();
}
/** Advance requires Iter to be comparable */
void advance(typename boost::iterator_difference<Iter>::type n) {
this->base_reference() += n;
if (this->base_reference() > end) throw OutOfBoundsException();
}
Iter end;
friend class boost::iterator_core_access;
};
} // namespace qpid
#endif /*!QPID_BOUNDEDITERATOR_H*/
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