From d0e4a703ed27752193ef76fd8131adc8f743fe72 Mon Sep 17 00:00:00 2001
From: Justin Viiret <justin.viiret@intel.com>
Date: Fri, 2 Jun 2017 11:26:59 +1000
Subject: [PATCH] ng_literal_analysis: reserve space for fwd_edges

---
 src/nfagraph/ng_literal_analysis.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/nfagraph/ng_literal_analysis.cpp b/src/nfagraph/ng_literal_analysis.cpp
index a6664b07..19660580 100644
--- a/src/nfagraph/ng_literal_analysis.cpp
+++ b/src/nfagraph/ng_literal_analysis.cpp
@@ -488,12 +488,14 @@ const char *describeColor(boost::default_color_type c) {
  */
 static
 vector<LitEdge> add_reverse_edges_and_index(LitGraph &lg) {
+    const size_t edge_count = num_edges(lg);
     vector<LitEdge> fwd_edges;
+    fwd_edges.reserve(edge_count);
     for (const auto &e : edges_range(lg)) {
         fwd_edges.push_back(e);
     }
 
-    vector<LitEdge> rev_map(2 * num_edges(lg));
+    vector<LitEdge> rev_map(2 * edge_count);
 
     for (const auto &e : fwd_edges) {
         LitVertex u = source(e, lg);