Antlr4.Tool.AttributeDict.Intersection C# (CSharp) Метод

        public ISet<string> Intersection([Nullable] AttributeDict other)
        {
            if (other == null || other.Size() == 0 || Size() == 0)
            {
                return new HashSet<string>();
            }

            ISet<string> result = new HashSet<string>(attributes.Keys);
            result.IntersectWith(other.attributes.Keys);
            return result;
        }