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/*
Copyright (c) 2006 Paolo Capriotti <p.capriotti@gmail.com>
(c) 2006 Maurizio Monge <maurizio.monge@kdemail.net>
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.
*/
#ifndef CHESSREFERENCE_H
#define CHESSREFERENCE_H
#include <boost/shared_ptr.hpp>
#include "serverinfo.h"
template <typename Pos>
struct ComparePosition {
static bool apply(const Pos& chessPos, const Pos& pos) {
return static_cast<const ChessPosition&>(chessPos) == pos;
}
};
/**
* @brief Common base for ServerReference specializations.
*/
template <typename Pos>
struct ServerReferenceBase {
typedef Pos Position;
class InfoVisitor : public boost::static_visitor<bool> {
const Position& m_position;
public:
InfoVisitor(const Position& position)
: m_position(position) { }
bool operator()(const ChessServerInfo<Pos>& info) const {
return ComparePosition<Pos>::apply(
*info.position,
m_position);
}
bool operator()(const PoolServerInfo<Pos>&) const {
return true; // FIXME
}
};
/**
* Compare a position with a @a ChessPosition. Used to check locally
* computed positions against server provided positions.
*/
static bool checkPosition(const Position& pos, const ChessPosition& serverPos) {
return serverPos == pos;
}
/**
* Retrieve a position shared pointer from a @a ChessPosition
* pointer. Used to retrieve variant specific position
* information from @a style12.position
*/
static boost::shared_ptr<Position> getPosition(
const boost::shared_ptr<ChessPosition>& pos) {
return boost::shared_ptr<Position>(
new Position(*pos));
}
/**
* Compare a position with partial information contained in another position.
*/
static bool checkPartialPosition(const Position& pos, const typename ServerInfo<Position>::type& server) {
return boost::apply_visitor(InfoVisitor(pos), server);
}
};
/**
* @brief ServerReference is used whenever information coming from
* the server has to be compared with variant specific structures.
*/
template <typename Pos>
struct ServerReference : public ServerReferenceBase<Pos> { };
template <>
struct ServerReference<ChessPosition>
: public ServerReferenceBase<ChessPosition> {
static boost::shared_ptr<ChessPosition> getPosition(
const boost::shared_ptr<ChessPosition>& pos) {
return pos;
}
};
#endif // CHESSREFERENCE_H
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