103 lines
2.4 KiB
C++
103 lines
2.4 KiB
C++
/*
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* This program source code file is part of KICAD, a free EDA CAD application.
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*
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* Copyright (C) 2017 CERN
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* Copyright (C) 2021 KiCad Developers, see AUTHORS.txt for contributors.
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*
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* @author Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you may find one here:
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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* or you may search the http://www.gnu.org website for the version 2 license,
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* or you may write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#ifndef INTRUSIVE_LIST_H
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#define INTRUSIVE_LIST_H
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///< A lightweight intrusive list container
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template <class T>
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class INTRUSIVE_LIST
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{
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public:
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INTRUSIVE_LIST<T>()
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{
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ListClear();
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}
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void ListClear()
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{
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m_prev = nullptr;
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m_next = nullptr;
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m_root = (T*) this;
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m_count = 1;
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}
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T* ListRemove()
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{
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if( m_prev )
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m_prev->m_next = m_next;
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if( m_next )
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m_next->m_prev = m_prev;
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m_root->m_count--;
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T* rv = nullptr;
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if( m_prev )
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rv = m_prev;
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else if( m_next )
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rv = m_next;
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m_root = nullptr;
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m_prev = nullptr;
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m_next = nullptr;
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return rv;
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}
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int ListSize() const
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{
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return m_root ? m_root->m_count : 0;
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}
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void ListInsert( T* item )
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{
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if( !m_root )
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m_root = item;
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if( m_next )
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m_next->m_prev = item;
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item->m_prev = (T*) this;
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item->m_next = m_next;
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item->m_root = m_root;
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m_root->m_count++;
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m_next = item;
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}
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T* ListNext() const { return m_next; };
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T* ListPrev() const { return m_prev; };
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private:
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int m_count;
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T* m_prev;
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T* m_next;
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T* m_root;
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};
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#endif /* INTRUSIVE_LIST_H */
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