/// <summary>
/// Performs a "minus" of set <c>b</c> from set <c>a</c>. This returns a set of all
/// the elements in set <c>a</c>, removing the elements that are also in set <c>b</c>.
/// The original sets are not modified during this operation. The result set is a <c>Clone()</c>
/// of this <c>Set</c> containing the elements from the operation.
/// </summary>
/// <param name="a">A set of elements.</param>
/// <returns>A set containing the elements from this set with the elements in <c>a</c> removed.</returns>
public Set Minus(Set a)
{
Set resultSet = (Set)this.Clone();
if (a != null)
{
resultSet.RemoveAll(a);
}
return(resultSet);
}
/// <summary>
/// Remove all the specified elements from this set, if they exist in this set.
/// </summary>
/// <param name="c">A collection of elements to remove.</param>
/// <returns><c>true</c> if the set was modified as a result of this operation.</returns>
public sealed override bool RemoveAll(ICollection c)
{
Set temp;
lock (c.SyncRoot)
{
temp = new HybridSet(c);
}
lock (_syncRoot)
{
return(_basisSet.RemoveAll(temp));
}
}
