From c6aa79b0dd87d9466b981d53e7f4d42a46a56892 Mon Sep 17 00:00:00 2001
From: Zeno Rogue <zeno@attnam.com>
Date: Fri, 30 Nov 2018 17:17:06 +0100
Subject: [PATCH] fixed an iterator invalidation bug in drawStandard

---
 hypgraph.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/hypgraph.cpp b/hypgraph.cpp
index b87e2175..6feeaa94 100644
--- a/hypgraph.cpp
+++ b/hypgraph.cpp
@@ -778,7 +778,11 @@ vector<tuple<heptspin, hstate, transmatrix, ld> > drawn_cells;
 void drawStandard() {
   drawn_cells.clear();
   drawn_cells.emplace_back(viewctr, hsOrigin, cview(), band_shift);
-  for(int i=0; i<isize(drawn_cells); i++) {
+  for(int i=0; i<isize(drawn_cells); i++) {    
+    // prevent reallocation due to insertion
+    if(drawn_cells.capacity() < drawn_cells.size() + 16)
+      drawn_cells.reserve(min<size_t>(2 * drawn_cells.size(), 128));
+
     const auto& dc = drawn_cells[i];
     auto& hs = get<0>(dc);
     auto& s = get<1>(dc);