DBStorageIterator.h

Go to the documentation of this file.

/*
 * This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
 *
 * 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:
 using iterator_category = std::forward_iterator_tag;
 using value_type = T;
 using difference_type = std::ptrdiff_t;
 using pointer = T*;
 using reference = T&;
 
 DBStorageIterator() : _index(nullptr), _pos(0), _end(0) { }
 DBStorageIterator(T const* const* index, uint32 size, uint32 pos = 0) : _index(index), _pos(pos), _end(size)
 {
 if (_pos < _end)
 {
 while (_pos < _end && !_index[_pos])
 ++_pos;
 }
 }
 
 T const* operator->() const { return _index[_pos]; }
 T const* operator*() const { return _index[_pos]; }
 
 bool operator==(DBStorageIterator const& right) const { /*ASSERT(_index == right._index, "Iterator belongs to a different container")*/ return _pos == right._pos; }
 
 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 const* const* _index;
 uint32 _pos;
 uint32 _end;
};
 
#endif // DBStorageIterator_h__