/*
  Copyright (C) 2018 David Robillard <d@drobilla.net>
  Copyright (C) 2006-2007 Chris Hamilton <chamilton@cs.dal.ca>

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

  This program 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.

  You should have received a copy of the GNU General Public License along with
  this program.  If not, see <https://www.gnu.org/licenses/>.
*/

#ifndef CHILBERT_BITVECITERATOR_HPP
#define CHILBERT_BITVECITERATOR_HPP

#include "chilbert/detail/BitVecMask.hpp"

#include <cstddef>

namespace chilbert {
namespace detail {

template <class BitVec>
class BitVecIteratorBase : public BitVecMask<typename BitVec::Rack>
{
public:
	using Mask = typename BitVec::Mask;

	BitVecIteratorBase& operator++()
	{
		Mask::operator++();
		return *this;
	}

	BitVecIteratorBase& operator--()
	{
		Mask::operator--();
		return *this;
	}

	bool operator==(const BitVecIteratorBase& rhs) const
	{
		return m_vec == rhs.m_vec && Mask::operator==(rhs);
	}

	bool operator!=(const BitVecIteratorBase& rhs) const
	{
		return !operator==(rhs);
	}

	bool operator*() const { return m_vec->test(*this); }

protected:
	BitVecIteratorBase(BitVec& vec, const size_t index)
	  : Mask{index}
	  , m_vec{&vec}
	{
	}

	BitVec* m_vec;
};

template <class BitVec>
class BitVecIterator : public BitVecIteratorBase<BitVec>
{
public:
	void set() { this->m_vec->set(*this); }
	void reset() { this->m_vec->reset(*this); }

private:
	friend BitVec;

	BitVecIterator(BitVec& vec, const size_t index)
	  : BitVecIteratorBase<BitVec>{vec, index}
	{
	}
};

template <class BitVec>
class ConstBitVecIterator : public BitVecIteratorBase<const BitVec>
{
private:
	friend BitVec;

	ConstBitVecIterator(const BitVec& vec, const size_t index)
	  : BitVecIteratorBase<const BitVec>{vec, index}
	{
	}
};

} // namespace detail
} // namespace chilbert

#endif