From 12c6d1fbe40d83d9a51f19d22f3fe49d288cf3d4 Mon Sep 17 00:00:00 2001
From: Zoltan Szabadka <szabadka@google.com>
Date: Wed, 15 Oct 2014 13:33:56 +0200
Subject: [PATCH] Apply const qualifier to call operator of comparator class.

---
 enc/cluster.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/enc/cluster.h b/enc/cluster.h
index 855a88d..60ce7f1 100644
--- a/enc/cluster.h
+++ b/enc/cluster.h
@@ -42,7 +42,7 @@ struct HistogramPair {
 };
 
 struct HistogramPairComparator {
-  bool operator()(const HistogramPair& p1, const HistogramPair& p2) {
+  bool operator()(const HistogramPair& p1, const HistogramPair& p2) const {
     if (p1.cost_diff != p2.cost_diff) {
       return p1.cost_diff > p2.cost_diff;
     }