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g++ *.cpp
main.cpp: In function ‘int main(int, char**)’:
main.cpp:102:18: error: cannot declare variable ‘bc’ to be of abstract type ‘TorusCondition’
   TorusCondition bc;
                  ^
main.cpp:22:7: note:   because the following virtual functions are pure within ‘TorusCondition’:
 class TorusCondition : public BoundaryCondition
       ^
main.cpp:19:16: note: 	virtual bool BoundaryCondition::boundary(BoundaryCondition::Daten&, int, int)
   virtual bool boundary(Daten& daten, int i, int j) = 0;
                ^
main.cpp:105:19: error: cannot declare variable ‘rules’ to be of abstract type ‘GameOfLifeRules’
   GameOfLifeRules rules(bc);
                   ^
main.cpp:40:7: note:   because the following virtual functions are pure within ‘GameOfLifeRules’:
 class GameOfLifeRules : public Regel
       ^
main.cpp:12:16: note: 	virtual void Regel::anwenden(Regel::Daten&)
   virtual void anwenden(Daten& daten) = 0;

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class TorusCondition : public BoundaryCondition
{
  public:
  bool boundary(Daten& daten, int i, int j) { //true, wenn zwei Felder benachbart sind
      int x1 = i / daten.cols();
      int y1 = i % daten.cols();
      int x2 = j / daten.cols();
      int y2 = j % daten.cols();
      int deltaX = abs(x1 - x2);
      if (deltaX = daten.rows() - 1) deltaX = 1; //an beiden Rändern
      int deltaY = abs(y1 - y2);
      if (deltaY = daten.cols() - 1) deltaY = 1;
      return deltaX < 2 && deltaY < 2;
  }
};

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  public:
  bool boundary(Daten& daten, int i, int j) { //true, wenn Feld[i][j] Leben ist
      i %= daten.cols(); if (i < 0) i += daten.cols(); //komme am Rand auf anderer Seite wieder rein
      j %= daten.rows(); if (j < 0) j += daten.rows();
      return daten[i][j];
  }