Make GridPoint support dictionaries

Add hashValue propertiy and Hashable protocol
7 years ago · 944fad0f02
parent 3e711561fa
commit 944fad0f02
1 changed files with 6 additions and 1 deletions
--- a/Sources/AOC2018/tools.swift
+++ b/Sources/AOC2018/tools.swift
@ -19,9 +19,14 @@ func == <T:Equatable> (tuple1:(T,T),tuple2:(T,T)) -> Bool
   return (tuple1.0 == tuple2.0) && (tuple1.1 == tuple2.1)
 }

-struct GridPoint: Equatable, Comparable {
+struct GridPoint: Equatable, Comparable, Hashable {
    var X = 0
    var Y = 0
+    var hashValue: Int {
+        get {
+            return X.hashValue ^ Y.hashValue
+        }
+    }

    static func == (lhs: GridPoint, rhs: GridPoint) -> Bool {
        return (lhs.X == rhs.X) && (lhs.Y == rhs.Y)