From 7cbab96fbb1061a665956c8b65f4876d5f02c094 Mon Sep 17 00:00:00 2001
From: Francois Fleuret <francois@fleuret.org>
Date: Sat, 8 Sep 2012 16:16:34 +0200
Subject: [PATCH] Cosmetics + fixed the buggy bug-check in retrieve_one_path.

---
 mtp_graph.cc | 30 +++++++++++++++++-------------
 1 file changed, 17 insertions(+), 13 deletions(-)

diff --git a/mtp_graph.cc b/mtp_graph.cc
index ecbbab5..c456601 100644
--- a/mtp_graph.cc
+++ b/mtp_graph.cc
@@ -229,8 +229,8 @@ int MTPGraph::is_dag() {
   int front_size = _nb_vertices, pred_front_size;
 
   do {
-    // We set the iteration field of all vertex with incoming edges to
-    // the current iteration value
+    // We set the last_change field of all the vertices with incoming
+    // edges to the current iteration value
     for(int f = 0; f < front_size; f++) {
       v = _front[f];
       for(e = v->leaving_edges; e; e = e->next_leaving_edge) {
@@ -241,7 +241,7 @@ int MTPGraph::is_dag() {
     pred_front_size = front_size;
     front_size = 0;
 
-    // We remove all the vertices without incoming edge
+    // We keep all the vertices with incoming nodes
     for(int f = 0; f < pred_front_size; f++) {
       v = _front[f];
       if(v->last_change == iteration) {
@@ -256,7 +256,7 @@ int MTPGraph::is_dag() {
 }
 
 // This method does not change the edge occupation. It only set
-// properly for every vertex the fields distance_from_source and
+// properly, for every vertex, the fields distance_from_source and
 // pred_edge_toward_source.
 
 void MTPGraph::find_shortest_path() {
@@ -370,7 +370,7 @@ void MTPGraph::find_best_paths(scalar_t *lengths) {
   // Put back the graph in its original state (i.e. invert edges which
   // have been inverted in the process)
   for(int k = 0; k < _nb_edges; k++) {
-    Edge *e = _edges + k;
+    e = _edges + k;
     if(e->occupied) { e->invert(); }
   }
 }
@@ -392,15 +392,19 @@ int MTPGraph::retrieve_one_path(Edge *e, Path *path) {
     int nb_choices = 0;
     for(f = e->terminal_vertex->leaving_edges; f; f = f->next_leaving_edge) {
       if(f->occupied) { nb_choices++; next = f; }
-      if(nb_choices == 0) {
-        cerr << "retrieve_one_path: Non-sink end point." << endl;
-        abort();
-      }
-      if(nb_choices > 1) {
-        cerr << "retrieve_one_path: Non node-disjoint paths." << endl;
-        abort();
-      }
     }
+
+#ifdef DEBUG
+    if(nb_choices == 0) {
+      cerr << "retrieve_one_path: Non-sink end point." << endl;
+      abort();
+    }
+    if(nb_choices > 1) {
+      cerr << "retrieve_one_path: Non node-disjoint paths." << endl;
+      abort();
+    }
+#endif
+
     e = next;
   }
 
-- 
2.20.1