From: Mikko Rasa <tdb@tdb.fi>
Date: Tue, 27 Nov 2012 07:38:29 +0000 (+0200)
Subject: Fix a crash if the linear program contains an empty column
X-Git-Url: http://git.tdb.fi/?a=commitdiff_plain;h=c8f5fd14a1fbdaaa9e1216dd5163d1f5c1b5ff27;p=libs%2Fgltk.git

Fix a crash if the linear program contains an empty column
---

diff --git a/source/layout.cpp b/source/layout.cpp
index b95ab92..74b33f0 100644
--- a/source/layout.cpp
+++ b/source/layout.cpp
@@ -383,10 +383,14 @@ bool Layout::LinearProgram::solve()
 	pricing out the constraint rows. */
 	for(vector<Column>::iterator i=columns.begin(); i!=columns.end(); ++i)
 	{
-		float objective = i->values.front();
-		i->values.front() = 0.0f;
-		for(vector<float>::iterator j=i->values.begin(); j!=i->values.end(); ++j)
-			i->values.front() += *j;
+		float objective = 0.0f;
+		if(!i->values.empty())
+		{
+			objective = i->values.front();
+			i->values.front() = 0.0f;
+			for(vector<float>::iterator j=i->values.begin(); j!=i->values.end(); ++j)
+				i->values.front() += *j;
+		}
 		i->values.resize(n_rows+1, 0.0f);
 		i->values.back() = objective;
 	}