From 575a18eed250669876ddf225cf8050e691eedd75 Mon Sep 17 00:00:00 2001
From: Mike Solomon <mike@apollinemike.com>
Date: Mon, 4 Apr 2011 10:41:08 -0400
Subject: [PATCH] Adds programming error for empty config vector in
 beam-quanting.cc.

This avoids a segmentation fault when the queue.top () is called.
---
 lily/beam-quanting.cc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lily/beam-quanting.cc b/lily/beam-quanting.cc
index e868e51d7f..e1116308ed 100644
--- a/lily/beam-quanting.cc
+++ b/lily/beam-quanting.cc
@@ -447,6 +447,12 @@ Beam_scoring_problem::solve () const {
   vector<Beam_configuration*> configs;
   generate_quants (&configs);
 
+  if (configs.empty ())
+    {
+      programming_error ("No viable beam quanting found.  Using unquanted y value.");
+      return unquanted_y;
+    }
+
   Beam_configuration *best = NULL;  
 
   bool debug =
-- 
2.39.2