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/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
Stockfish 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 3 of the License, or
(at your option) any later version.
Stockfish 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 ENDGAME_H_INCLUDED
#define ENDGAME_H_INCLUDED
#include <map>
#include <string>
#include "position.h"
#include "types.h"
/// EndgameType lists all supported endgames
enum EndgameType {
// Evaluation functions
KNNK, // KNN vs K
KXK, // Generic "mate lone king" eval
KBNK, // KBN vs K
KPK, // KP vs K
KRKP, // KR vs KP
KRKB, // KR vs KB
KRKN, // KR vs KN
KQKP, // KQ vs KP
KQKR, // KQ vs KR
// Scaling functions
SCALING_FUNCTIONS,
KBPsK, // KB and pawns vs K
KQKRPs, // KQ vs KR and pawns
KRPKR, // KRP vs KR
KRPKB, // KRP vs KB
KRPPKRP, // KRPP vs KRP
KPsK, // K and pawns vs K
KBPKB, // KBP vs KB
KBPPKB, // KBPP vs KB
KBPKN, // KBP vs KN
KNPK, // KNP vs K
KNPKB, // KNP vs KB
KPKP // KP vs KP
};
/// Endgame functions can be of two types depending on whether they return a
/// Value or a ScaleFactor. Type eg_fun<int>::type returns either ScaleFactor
/// or Value depending on whether the template parameter is 0 or 1.
template<int> struct eg_fun { typedef Value type; };
template<> struct eg_fun<1> { typedef ScaleFactor type; };
/// Base and derived templates for endgame evaluation and scaling functions
template<typename T>
struct EndgameBase {
virtual ~EndgameBase() {}
virtual Color strong_side() const = 0;
virtual T operator()(const Position&) const = 0;
};
template<EndgameType E, typename T = typename eg_fun<(E > SCALING_FUNCTIONS)>::type>
struct Endgame : public EndgameBase<T> {
explicit Endgame(Color c) : strongSide(c), weakSide(~c) {}
Color strong_side() const { return strongSide; }
T operator()(const Position&) const;
private:
Color strongSide, weakSide;
};
/// The Endgames class stores the pointers to endgame evaluation and scaling
/// base objects in two std::map. We use polymorphism to invoke the actual
/// endgame function by calling its virtual operator().
class Endgames {
typedef std::map<Key, EndgameBase<eg_fun<0>::type>*> M1;
typedef std::map<Key, EndgameBase<eg_fun<1>::type>*> M2;
M1 m1;
M2 m2;
M1& map(M1::mapped_type) { return m1; }
M2& map(M2::mapped_type) { return m2; }
template<EndgameType E> void add(const std::string& code);
public:
Endgames();
~Endgames();
template<typename T> T probe(Key key, T& eg) {
return eg = map(eg).count(key) ? map(eg)[key] : NULL;
}
};
#endif // #ifndef ENDGAME_H_INCLUDED
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