public ushort this[Symbol sym]
{
get
{
return _lookup[sym];
}
}
public ushort AddSymbol(Symbol s)
{
if (_lookup.ContainsKey(s))
{
return _lookup[s];
}
_store.Add(s);
ushort idx = (ushort)(_store.Count - 1);
_lookup.Add(s, idx);
return idx;
}