public LayerCell(Layer layer, int row, int column, Pin pin = null)
{
Row = row;
Column = column;
Links = _links = new LayerCellLinkSet(layer, row, column);
Neighbors = new LayerCellNeighborSet(layer, row, column);
Pin = pin;
IsValidCell = true;
}
private InvalidCell()
{
Links = new LayerCellLinkSet(null, -2, -2);
Neighbors = new LayerCellNeighborSet(null, -2, -2);
}