This is a iterated prisoner's dilemma simulator. It enables the user to create custom strategies and let them clash in a tournament of iterated prisoner's dilemma game.
To build the project, it required to have CMake 3.5 or higher installed on your system. On Linux, this is simply taken care of by
sudo apt-get install cmake.
Then
cmake CMakeLists.txt make ./ipd
will start the program.
The user is requested to enter desired number of rounds, the probability of ending the game after each round, probability of exchanging players' actions, and the payoff matrix. Then, the tournament is run and results are printed in the console. Example:
PLAYER 1 PLAYER 2 SCORE 1 SCORE 2 S/T 1 S/T 2 C/D 1 C/D 2
-----------------------------------------------------------------------------------------
Cooperator Cooperator 303 303 3 3 101/0 101/0
Cooperator Defector 0 505 0 5 101/0 0/101
Cooperator Alternator 153 403 1.51485 3.9901 101/0 51/50
Cooperator Appeaser 303 303 3 3 101/0 101/0
Cooperator TitForTat 303 303 3 3 101/0 101/0
Cooperator Random 153 403 1.51485 3.9901 101/0 51/50
Cooperator Punisher 303 303 3 3 101/0 101/0
Cooperator Forgiver 303 303 3 3 101/0 101/0
To create custom strategy, simply implement a new class in the Strategies/ folder. It has to implement Action strategy(Player* other_player) method, returning the player's response to other player's. The parameters to consider for the response can be e.g. current action and action history of either player's and their statistics, internal data structures, randomness, etc.