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//-----------------------------------------------------------------------------
/** @file libboardgame_base/Rating.h
@author Markus Enzenberger
@copyright GNU General Public License version 3 or later */
//-----------------------------------------------------------------------------
#ifndef LIBBOARDGAME_BASE_RATING_H
#define LIBBOARDGAME_BASE_RATING_H
#include <cmath>
#include <iosfwd>
namespace libboardgame_base {
using namespace std;
//-----------------------------------------------------------------------------
/** Elo-rating of a player. */
class Rating
{
public:
friend ostream& operator<<(ostream& out, Rating rating);
friend istream& operator>>(istream& in, Rating& rating);
explicit Rating(double elo = 0) : m_elo(elo) { }
/** Get the expected outcome of a game.
@param elo_opponent Elo-rating of the opponent.
@param nu_opponents The number of opponents (all with the same rating
elo_opponent) */
double get_expected_result(Rating elo_opponent,
unsigned nu_opponents = 1) const;
/** Update a rating after a game.
@param game_result The outcome of the game (0=loss, 0.5=tie, 1=win)
@param elo_opponent Elo-rating of the opponent.
@param k_value The K-value
@param nu_opponents The number of opponents (all with the same rating
elo_opponent) */
void update(double game_result, Rating elo_opponent, double k_value = 32,
unsigned nu_opponents = 1);
double get() const { return m_elo; }
private:
double m_elo;
};
//-----------------------------------------------------------------------------
} // namespace libboardgame_base
#endif // LIBBOARDGAME_BASE_RATING_H
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