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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#ifndef COMMON_LIST_INTERN_H
#define COMMON_LIST_INTERN_H
#include "common/scummsys.h"
namespace Common {
template<typename T> class List;
namespace ListInternal {
struct NodeBase {
NodeBase *_prev;
NodeBase *_next;
};
template<typename T>
struct Node : public NodeBase {
T _data;
Node(const T &x) : _data(x) {}
};
template<typename T> struct ConstIterator;
template<typename T>
struct Iterator {
typedef Iterator<T> Self;
typedef Node<T> * NodePtr;
typedef T & ValueRef;
typedef T * ValuePtr;
typedef T ValueType;
NodeBase *_node;
Iterator() : _node(nullptr) {}
explicit Iterator(NodeBase *node) : _node(node) {}
// Prefix inc
Self &operator++() {
if (_node)
_node = _node->_next;
return *this;
}
// Postfix inc
Self operator++(int) {
Self tmp(_node);
++(*this);
return tmp;
}
// Prefix dec
Self &operator--() {
if (_node)
_node = _node->_prev;
return *this;
}
// Postfix dec
Self operator--(int) {
Self tmp(_node);
--(*this);
return tmp;
}
ValueRef operator*() const {
assert(_node);
return static_cast<NodePtr>(_node)->_data;
}
ValuePtr operator->() const {
return &(operator*());
}
bool operator==(const Self &x) const {
return _node == x._node;
}
bool operator!=(const Self &x) const {
return _node != x._node;
}
};
template<typename T>
struct ConstIterator {
typedef ConstIterator<T> Self;
typedef const Node<T> * NodePtr;
typedef const T & ValueRef;
typedef const T * ValuePtr;
const NodeBase *_node;
ConstIterator() : _node(nullptr) {}
explicit ConstIterator(const NodeBase *node) : _node(node) {}
ConstIterator(const Iterator<T> &x) : _node(x._node) {}
// Prefix inc
Self &operator++() {
if (_node)
_node = _node->_next;
return *this;
}
// Postfix inc
Self operator++(int) {
Self tmp(_node);
++(*this);
return tmp;
}
// Prefix dec
Self &operator--() {
if (_node)
_node = _node->_prev;
return *this;
}
// Postfix dec
Self operator--(int) {
Self tmp(_node);
--(*this);
return tmp;
}
ValueRef operator*() const {
assert(_node);
return static_cast<NodePtr>(_node)->_data;
}
ValuePtr operator->() const {
return &(operator*());
}
bool operator==(const Self &x) const {
return _node == x._node;
}
bool operator!=(const Self &x) const {
return _node != x._node;
}
};
template<typename T>
bool operator==(const Iterator<T>& a, const ConstIterator<T>& b) {
return a._node == b._node;
}
template<typename T>
bool operator!=(const Iterator<T>& a, const ConstIterator<T>& b) {
return a._node != b._node;
}
}
} // End of namespace Common
#endif
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