public override IEnumerable <Position> Execute(BrainfuckEnv be)
{
yield return(_pos);
switch (_char)
{
case '+': be.Inc(); break;
case '-': be.Dec(); break;
case '<': be.MoveLeft(); break;
case '>': be.MoveRight(); break;
case '.': be.BfOutput(); break;
case ',': be.BfInput(); break;
default:
break;
}
}
