[初C++]coderetreatで作ったlifegame

game_of_life.cpp

#include <iostream>
#include <vector>
#include <map>
#include <string>
#include <unistd.h>
using namespace std;

class Lifegame
{
  private:
    vector<pair<int, int> > living_cells;
    int col;
    int row;
    map<pair<int, int>, int> calculate_alive_counts() {
      map<pair<int, int>, int> alive_counts;
      for (pair<int, int> living_cell : living_cells) {
        int _col = living_cell.first;
        int _row = living_cell.second;
        for (int i = -1; i <= 1; i++) {
          for (int j = -1; j <= 1; j++) {
            if (i == 0 && j == 0) continue;
            pair<int, int> cood = make_pair(_col + i, _row + j);
            alive_counts[cood] = alive_counts[cood] + 1;
          }
        }
      }
      return alive_counts;
    }

  public:
    void initialize(int x, int y) {
      col = x;
      row = y;
      living_cells = {};
    }

    bool is_alive(int col, int row) {
      for (pair<int, int> living_cell : living_cells) {
        if (living_cell == make_pair(col, row))
          return true;
      }
      return false;
    }

    void set_alives(vector<pair<int, int> > alives) {
      living_cells = alives;
    }

    void next() {
      map<pair<int, int>, int> alive_counts = calculate_alive_counts();
      vector<pair<int, int> > next_livings;

      for (int row = 0; row < this->row; row++) {
        for (int col = 0; col < this->col; col++) {
          pair<int, int> cood = make_pair(col,row);
          if (is_alive(col, row)) {
            if (alive_counts[cood] == 2 || alive_counts[cood] == 3) {
              next_livings.push_back(cood);
            }
          } else {
            if (alive_counts[cood] == 3) {
              next_livings.push_back(cood);
            }
          }
        }
      }

      set_alives(next_livings);
    }

    void pretty_print() {
      string result;
      for (int row = 0; row < this->row; row++) {
        for (int col = 0; col < this->col; col++) {
          if (is_alive(col, row)) {
            result += "1";
          } else {
            result += "0";
          }
        }
        result += "\n";
      }
      cout << result;
      cout<<"\e[" << this->row << "A";
    }
};


int main() {
  Lifegame lifegame;
  vector<pair<int, int> > data = {make_pair(0, 1), make_pair(1, 1), make_pair(2, 1)};
  //vector<pair<int, int> > grider = {make_pair(0, 0), make_pair(1, 0), make_pair(2, 0), make_pair(0, 1), make_pair(1, 2)};
  lifegame.initialize(3, 3);
  lifegame.set_alives(data);
  while (1) {
    lifegame.pretty_print();
    lifegame.next();
    sleep(1);
  }
}