Question

Doing something like this

public Multime<T> Difference(Multime<T> list)
{
    Multime<T> diff = new Multime<T>();
    for (int i = 0; i < list.Multisets.Count() - 1; i++)
    {
        foreach (T el in list.multiSets[i].Multimea)
        {
            if (!(list.multiSets[i + 1].Multimea.Exists(element => EqualityComparer<T>.Default.Equals(element, el))))
                diff.Multimea.Add(el);

        }
        list.multiSets[i + 1] = diff;
        if (i < list.multiSets.Count() - 1)
            diff.Multimea.RemoveAll(item => EqualityComparer<T>.Default.Equals(item, item));
    }
...

after diff.Multimea.RemoveAll(item => EqualityComparer<T>.Default.Equals(item, item));
the list.multiSets[i + 1] is cleared too. How can i resolve this, so that they wont be connected this way, I dont want list.multiSets[i + 1] to be cleared.

public Multime<T> this[int index]
{
    get { return this.multiSets[index]; }
    set { this.multiSets[index] = value; }
}

this is the indexer if it helps 🙂

Answer 1

I don’t want list.multiSets[i+1] to be cleared too.

You’ll have to fill it with a copy:

//list.multiSets[i + 1] = diff;
  list.multiSets[i + 1] = diff.ToList();

Your diff and list.multiSets[x] values are reference types. This means that you original assignment only copies a reference to a list, not the list itself. ToList() is a compact way of making a clone of the list.