public IEnumerable <NumbersGame> GenerateIntermediates()
{
var ret = new List <NumbersGame>();
int maxIndex = _numbers.Count - 1;
// Take each possible pairing in turn, and apply all possible operations
for (int ix1 = 0; ix1 < maxIndex; ++ix1)
{
int i1 = _numbers[ix1];
for (int ix2 = ix1 + 1; ix2 <= maxIndex; ++ix2)
{
int i2 = _numbers[ix2];
foreach (Operator op in OperationValues)
{
int?v = Operation.Apply(i1, i2, op);
if (v != null)
{
var game = new NumbersGame(this); // Deep copy
game._numbers.RemoveAt(ix2); // Remove the latter ix2 element
game._numbers[ix1] = v.Value; // Overwrite the earlier ix1 element with the result
game._history.Add(new Operation(i1, i2, op));
ret.Add(game);
}
}
}
}
return(ret);
}
public IGame CreateDescendent(IOperation op)
{
var game = new NumbersGame(this); // Deep copy - takes initial values, history and current values
game._numbers.RemoveAt(ix2); // Remove the latter ix2 element
game._numbers[ix1] = v.Value; // Overwrite the earlier ix1 element with the result
game._history.Add(new Operation(i1, i2, op));
ret.Add(game);
throw new NotImplementedException();
}
// Copy constructor (deep)
public NumbersGame(NumbersGame game)
{
_numbers.AddRange(game._numbers);
_history.AddRange(game._history);
Target = game.Target;
}