[Swift 4] Update Graph

Author: remlostime

Graph/Graph.playground/Contents.swift

@@ -1,5 +1,11 @@
 import Graph
 
+// last checked with Xcode 9.0b4
+#if swift(>=4.0)
+print("Hello, Swift 4!")
+#endif
+
+
 for graph in [AdjacencyMatrixGraph<Int>(), AdjacencyListGraph<Int>()] {
 
   let v1 = graph.createVertex(1)

Graph/Graph.playground/timeline.xctimeline

@@ -3,7 +3,7 @@
    version = "3.0">
    <TimelineItems>
       <LoggerValueHistoryTimelineItem
-         documentLocation = "#CharacterRangeLen=12&amp;CharacterRangeLoc=1238&amp;EndingColumnNumber=15&amp;EndingLineNumber=38&amp;StartingColumnNumber=3&amp;StartingLineNumber=38&amp;Timestamp=498745868.545441"
+         documentLocation = "file:///Users/kachen/src/swift-algorithm-club/Graph/Graph.playground#CharacterRangeLen=12&amp;CharacterRangeLoc=1322&amp;EndingColumnNumber=4&amp;EndingLineNumber=45&amp;StartingColumnNumber=7&amp;StartingLineNumber=44&amp;Timestamp=523289935.918656"
          selectedRepresentationIndex = "1"
          shouldTrackSuperviewWidth = "NO">
       </LoggerValueHistoryTimelineItem>

Graph/GraphTests/GraphTests.swift

@@ -10,6 +10,14 @@ import XCTest
 
 class GraphTests: XCTestCase {
 
+  func testSwift4() {
+    // last checked with Xcode 9.0b4
+    #if swift(>=4.0)
+      print("Hello, Swift 4!")
+    #endif
+
+  }
+
   func testAdjacencyMatrixGraphDescription() {
 
     let graph = AdjacencyMatrixGraph<String>()