DBStorageIterator.h

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/*
 * Copyright (C) 2008-2016 TrinityCore <http://www.trinitycore.org/>
 *
 * 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 <http://www.gnu.org/licenses/>.
 */

#ifndef DBStorageIterator_h__
#define DBStorageIterator_h__

#include "Define.h"
#include <iterator>

template<class T>
class DBStorageIterator : public std::iterator<std::forward_iterator_tag, T>
{
public:
 DBStorageIterator() : _index(nullptr), _pos(0), _end(0) { }
 DBStorageIterator(T** index, uint32 size, uint32 pos = 0) : _index(index), _pos(pos), _end(size)
 {
 if (_pos < _end)
 {
 while (_pos < _end && !_index[_pos])
 ++_pos;
 }
 }

 T* operator->() { return _index[_pos]; }
 T* operator*() { return _index[_pos]; }

 bool operator==(DBStorageIterator const& right) const { /*ASSERT(_index == right._index, "Iterator belongs to a different container")*/ return _pos == right._pos; }
 bool operator!=(DBStorageIterator const& right) const { return !(*this == right); }

 DBStorageIterator& operator++()
 {
 if (_pos < _end)
 {
 do
 ++_pos;
 while (_pos < _end && !_index[_pos]);
 }

 return *this;
 }

 DBStorageIterator operator++(int)
 {
 DBStorageIterator tmp = *this;
 ++*this;
 return tmp;
 }

private:
 T** _index;
 uint32 _pos;
 uint32 _end;
};

#endif // DBStorageIterator_h__