@@ -80,7 +80,7 @@ public struct Queue<Element>: CustomStringConvertible, Sequence {
8080:description:Constructor.
8181*/
8282public init ( ) {
83- list= DoublyLinkedList < Element > ( )
83+ list= DoublyLinkedList ( )
8484}
8585
8686//
@@ -89,7 +89,7 @@ public struct Queue<Element>: CustomStringConvertible, Sequence {
8989//the next value in the sequence of nodes.
9090//:returns:Queue.Generator
9191//
92- public func makeIterator( ) -> Queue . Iterator {
92+ public func makeIterator( ) -> Iterator {
9393return list. makeIterator ( )
9494}
9595
@@ -118,21 +118,21 @@ public struct Queue<Element>: CustomStringConvertible, Sequence {
118118mutating public func removeAll( ) {
119119list. removeAll ( )
120120}
121- }
122121
123- public func + < Element > ( lhs: Queue < Element > , rhs: Queue < Element > ) -> Queue < Element > {
124- var q = Queue < Element > ( )
125- for x in lhs{
126- . enqueue ( x)
127- }
128- for x in rhs{
129- . enqueue ( x)
130- }
131- return q
132- }
122+ public static func + ( lhs: Queue , rhs: Queue ) -> Queue < Element > {
123+ var q = Queue < Element > ( )
124+ for x in lhs{
125+ . enqueue ( x)
126+ }
127+ for x in rhs{
128+ . enqueue ( x)
129+ }
130+ return q
131+ }
133132
134- public func += < Element> ( lhs: inout Queue < Element > , rhs: Queue < Element > ) {
135- for x in rhs{
136- lhs. enqueue ( x)
137- }
133+ public static func += ( lhs: inout Queue , rhs: Queue ) {
134+ for x in rhs{
135+ lhs. enqueue ( x)
136+ }
137+ }
138138}