From 3a9fd0ca1ec531217fede2bfa3e79b5afa78aa53 Mon Sep 17 00:00:00 2001
From: "Sascha L. Teichmann" <sascha.teichmann@intevation.de>
Date: Mon, 27 Feb 2017 16:12:19 +0100
Subject: [PATCH] Cosmetical: Replaced a map to bools by a map with struct{}
 values because its more a set.

---
 cmd/mtredisalize/changetracker.go | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/cmd/mtredisalize/changetracker.go b/cmd/mtredisalize/changetracker.go
index 331b46f..04ae678 100644
--- a/cmd/mtredisalize/changetracker.go
+++ b/cmd/mtredisalize/changetracker.go
@@ -23,28 +23,28 @@ type quantizedXZ struct {
 }
 
 type changeTracker struct {
-	changes map[quantizedXZ]bool
+	changes map[quantizedXZ]struct{}
 	mutex   sync.Mutex
 }
 
 func newChangeTracker() *changeTracker {
-	return &changeTracker{changes: make(map[quantizedXZ]bool)}
+	return &changeTracker{changes: make(map[quantizedXZ]struct{})}
 }
 
 func (ct *changeTracker) BlockChanged(coord common.Coord) {
 	ct.mutex.Lock()
 	ct.changes[quantizedXZ{
 		X: coord.X / quantizationFactor,
-		Z: coord.Z / quantizationFactor}] = true
+		Z: coord.Z / quantizationFactor}] = struct{}{}
 	ct.mutex.Unlock()
 }
 
 func (ct *changeTracker) FlushChanges(url string) {
-	var oldChanges map[quantizedXZ]bool
+	var oldChanges map[quantizedXZ]struct{}
 	ct.mutex.Lock()
 	if len(ct.changes) > 0 {
 		oldChanges = ct.changes
-		ct.changes = make(map[quantizedXZ]bool)
+		ct.changes = make(map[quantizedXZ]struct{})
 	}
 	ct.mutex.Unlock()
 	if oldChanges == nil {
@@ -74,5 +74,4 @@ func (ct *changeTracker) FlushChanges(url string) {
 			log.Printf("WARN: posting changes to %s failed: %s\n", url, err)
 		}
 	}()
-	return
 }