/*
 * \brief  Utility for checking array bounds
 * \author Norman Feske
 * \date   2011-02-18
 */

/*
 * Copyright (C) 2011-2017 Genode Labs GmbH
 *
 * This file is part of the Genode OS framework, which is distributed
 * under the terms of the GNU Affero General Public License version 3.
 */

#ifndef _NOUX__RANGE_CHECKED_INDEX_H_
#define _NOUX__RANGE_CHECKED_INDEX_H_

namespace Noux {

	class Index_out_of_range { };
	template <typename> struct Range_checked_index;
}


template <typename T>
struct Noux::Range_checked_index
{
	T value;
	T const max;

	Range_checked_index(T value, T max) : value(value), max(max) { }

	Range_checked_index<T> operator++ (int)
	{
		T old_value = value;

		if (++value >= max)
			throw Index_out_of_range();

		return Range_checked_index<T>(old_value, max);
	}

	operator T () { return value; }
};

#endif /* _NOUX__RANGE_CHECKED_INDEX_H_ */