System.Security.Util.StringExpressionSet.Union C# (CSharp) Method

        public StringExpressionSet Union( StringExpressionSet ses )
        {
            // If either set is empty, the union represents a copy of the other.
            
            if (ses == null || ses.IsEmpty())
                return this.Copy();
    
            if (this.IsEmpty())
                return ses.Copy();
            
            CheckList();
            ses.CheckList();
            
            // Perform the union
            // note: insert smaller set into bigger set to reduce needed comparisons
            
            StringExpressionSet bigger = ses.m_list.Count > this.m_list.Count ? ses : this;
            StringExpressionSet smaller = ses.m_list.Count <= this.m_list.Count ? ses : this;
    
            StringExpressionSet unionSet = bigger.Copy();
            
            unionSet.Reduce();
            
            for (int index = 0; index < smaller.m_list.Count; ++index)
            {
                unionSet.AddSingleExpressionNoDuplicates( (String)smaller.m_list[index] );
            }
            
            unionSet.GenerateString();
            
            return unionSet;
        }