From 0985b4406dce208fc2e8aa7d54ef1b040c60f240 Mon Sep 17 00:00:00 2001
From: TheNumbat <mjslater@andrew.cmu.edu>
Date: Thu, 15 Oct 2020 12:28:31 -0400
Subject: [PATCH] give < op by default

---
 src/student/meshedit.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/student/meshedit.cpp b/src/student/meshedit.cpp
index 66e0e13..76e09b8 100644
--- a/src/student/meshedit.cpp
+++ b/src/student/meshedit.cpp
@@ -460,6 +460,16 @@ struct Edge_Record {
     float cost;
 };
 
+/* Comparison operator for Edge_Records so std::set will properly order them */
+bool operator<(const Edge_Record &r1, const Edge_Record &r2) {
+    if (r1.cost != r2.cost) {
+        return r1.cost < r2.cost;
+    }
+    Halfedge_Mesh::EdgeRef e1 = r1.edge;
+    Halfedge_Mesh::EdgeRef e2 = r2.edge;
+    return &*e1 < &*e2;
+}
+
 /** Helper type for quadric simplification
  *
  * A PQueue is a minimum-priority queue that
-- 
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