From 78147ee8d7d5ee86d5bd9438c864a3c7bb063ee0 Mon Sep 17 00:00:00 2001
From: HungMingWu <u9089000@gmail.com>
Date: Sat, 8 Jan 2022 11:42:46 +0800
Subject: [PATCH] Fix compile error at GCC11

Fixes #3273

Signed-off-by: HungMingWu <u9089000@gmail.com>
---
 docs/CONTRIBUTORS | 1 +
 src/V3TSP.cpp     | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/docs/CONTRIBUTORS b/docs/CONTRIBUTORS
index 38d913faa..6b55ee4dc 100644
--- a/docs/CONTRIBUTORS
+++ b/docs/CONTRIBUTORS
@@ -31,6 +31,7 @@ Graham Rushton
 Harald Heckmann
 Howard Su
 Huang Rui
+HungMingWu
 HyungKi Jeong
 Iru Cai
 Ivan Vnučec
diff --git a/src/V3TSP.cpp b/src/V3TSP.cpp
index 371bbb892..4032a0622 100644
--- a/src/V3TSP.cpp
+++ b/src/V3TSP.cpp
@@ -141,7 +141,7 @@ private:
     }
 
     struct EdgeListCmp final {
-        bool operator()(const EdgeList* ap, const EdgeList* bp) {
+        bool operator()(const EdgeList* ap, const EdgeList* bp) const {
             // Simply compare heads
             return edgeCmp(bp->back(), ap->back());
         }