[geos-commits] r3217 - trunk/src/operation/overlay/snap

[svn_geos at osgeo.org]

Author: strk
Date: 2011-02-13 14:31:03 -0800 (Sun, 13 Feb 2011)
New Revision: 3217

Modified:
   trunk/src/operation/overlay/snap/LineStringSnapper.cpp
Log:
Guard againts empty vectors before decrementing .end()

Modified: trunk/src/operation/overlay/snap/LineStringSnapper.cpp
===================================================================
--- trunk/src/operation/overlay/snap/LineStringSnapper.cpp	2011-02-13 22:30:55 UTC (rev 3216)
+++ trunk/src/operation/overlay/snap/LineStringSnapper.cpp	2011-02-13 22:31:03 UTC (rev 3217)
@@ -63,6 +63,8 @@
 LineStringSnapper::snapVertices(geom::CoordinateList& srcCoords,
 			const geom::Coordinate::ConstVect& snapPts)
 {
+  if ( srcCoords.empty() ) return;
+
 	using geom::CoordinateList;
 
 	geom::Coordinate::ConstVect::const_iterator not_found = snapPts.end();
@@ -170,6 +172,9 @@
 cerr << " Snapping segment from: " << srcCoords << endl;
 #endif
 
+  // nothing to do if there are no source coords..
+  if ( srcCoords.empty() ) return;
+
 	for ( Coordinate::ConstVect::const_iterator
 			it=snapPts.begin(), end=snapPts.end();
 			it != end;