private Set(Set set, IEnumerable<Column> newcolumns)
{
int incsize = newcolumns.Count();
this.columns = set.columns.Union(newcolumns).ToArray();
this.positions = set.positions;
this.tuples = set.tuples.Select(t => t.AddColumns(incsize)).ToList();
}
public Set AddTuple(NameValues values)
{
Set set = new Set(this);
Tuple tuple = new Tuple(this.columns.Length);
foreach (string name in values.Values.Keys)
tuple[this.positions[name]] = values.Values[name];
set.tuples.Add(tuple);
return set;
}
private Set(Set set)
{
this.columns = set.columns;
this.positions = set.positions;
this.tuples = new List<Tuple>(set.tuples);
}