Cosmetics + added comments.

[mtp.git] / mtp_graph.h

diff --git a/mtp_graph.h b/mtp_graph.h
index 9093a8b..b07e461 100644 (file)
--- a/mtp_graph.h
+++ b/mtp_graph.h
@@ -38,6 +38,10 @@ class Edge;
 
 class MTPGraph {
   void update_positivized_lengths();
+  // It may happen that numerical errors in update_positivized_lengths
+  // make the resulting lengths negative, albeit very small. The
+  // following method force such length to zero, and print the
+  // correction when compiled in VERBOSE mode.
   void force_positivized_lengths();
   // Set the edge pred_edge_toward_source correspondingly to the path
   // of shortest length. The current implementation is not Dijkstra's!