init

.gitignore

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+*.out
+*.o
+.gdb_history
+game_theory_tournament

Makefile

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+main:
+	g++ source/main.cpp -o game_theory_tournament
+
+clean:
+	-rm game_theory_tournament

source/Player.hpp

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+#ifndef PLAYER_H
+#define PLAYER_H
+
+typedef enum {
+    COOPERATE,
+    CONFLICT,
+} reaction_t;
+
+class Player {
+  public:
+    long points = 0;
+    const char * name;
+    virtual void new_game()                                      = 0;
+    virtual reaction_t play()                                    = 0;
+    virtual void push_result(reaction_t opponents_last_reaction) = 0;
+};
+
+#endif

source/RandomPlayer.hpp

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+#include "Player.hpp"
+
+#include <stdlib.h>
+
+class RandomPlayer : public Player {
+  public:
+    RandomPlayer() {
+        name = "Randy";
+    }
+
+    void new_game() override { ; }
+    void push_result(reaction_t opponents_last_reaction) override { ; }
+
+    reaction_t play() override {
+        return (rand() % 2) ? COOPERATE : CONFLICT;
+    }
+};

source/main.cpp

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+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h>
+#include <vector>
+
+#include "Player.hpp"
+#include "RandomPlayer.hpp"
+
+using namespace std;
+
+vector<Player *> players;
+
+const int ROUND_COUNT = 200;
+
+inline
+void print_round(reaction_t r1, reaction_t r2) {
+    const char * const color_table[] = {
+        [COOPERATE] = "\033[32m",
+        [CONFLICT]  = "\033[31m",
+    };
+
+    printf("  %sO\033[0m %sO\033[0m\n", color_table[r1], color_table[r2]);
+}
+
+inline
+void play_round(Player * const p1, Player * const p2) {
+    reaction_t p1_play = p1->play();
+    reaction_t p2_play = p2->play();
+
+    print_round(p1_play, p2_play);
+
+    if (p1_play == COOPERATE && p2_play == COOPERATE) {
+        p1->points += 3;
+        p2->points += 3;
+    } else if (p1_play == CONFLICT && p2_play == CONFLICT) {
+        p1->points += 1;
+        p2->points += 1;
+    } else {
+        Player * const pw = (p1_play == CONFLICT) ? p1 : p2;
+        pw->points += 5;
+    }
+}
+
+signed main() {
+    srand(time(NULL));
+
+    players.push_back(new RandomPlayer());
+    players.push_back(new RandomPlayer());
+    players.push_back(new RandomPlayer());
+
+    for (int i = 0; i < players.size() - 1; i++) {
+        for (int h = i + 1; h < players.size(); h++) {
+            printf("%s VS %s\n", players[i]->name, players[h]->name);
+            players[i]->new_game();
+            players[h]->new_game();
+            for (int c = 0; c < ROUND_COUNT; c++) {
+                play_round(players[i], players[h]);
+            }
+        }
+    }
+
+    for (const auto &p : players) {
+        printf("%s: %ld\n", p->name, p->points);
+    }
+}