From 944fad0f02e676eb78ba6a6a80a06ccc014918a0 Mon Sep 17 00:00:00 2001
From: Peter <peter.resch@charter.net>
Date: Sat, 15 Dec 2018 00:47:20 -0600
Subject: [PATCH] Make GridPoint support dictionaries

Add hashValue propertiy and Hashable protocol
---
 Sources/AOC2018/tools.swift | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Sources/AOC2018/tools.swift b/Sources/AOC2018/tools.swift
index 87ddc15..1870f23 100644
--- 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)