Comment update.

[mtp.git] / mtp_graph.cc

diff --git a/mtp_graph.cc b/mtp_graph.cc
index 2dd145d..6ce84c4 100644 (file)
--- a/mtp_graph.cc
+++ b/mtp_graph.cc
@@ -24,7 +24,6 @@
 
 #include "mtp_graph.h"
 
-// #include <iostream>
 #include <float.h>
 
 using namespace std;
@@ -161,9 +160,6 @@ void MTPGraph::print_dot(ostream *os) {
   (*os) << "        " << _sink->id << " [peripheries=2];" << endl;
   for(int k = 0; k < _nb_edges; k++) {
     Edge *e = _edges + k;
-    // (*os) << "  " << e->origin_vertex->id << " -> " << e->terminal_vertex->id
-    // << ";"
-    // << endl;
     (*os) << "        " << e->origin_vertex->id << " -> " << e->terminal_vertex->id
           << " [";
     if(e->occupied) {
@@ -191,10 +187,21 @@ void MTPGraph::force_positivized_lengths() {
 #endif
   for(int k = 0; k < _nb_edges; k++) {
     Edge *e = _edges + k;
+
     if(e->positivized_length < 0) {
+
 #ifdef VERBOSE
-      residual_error -= e->positivized_length;
-      max_error = max(max_error, - e->positivized_length);
+      if((e->origin_vertex->last_change < 0 && e->terminal_vertex->last_change >= 0) ||
+         (e->origin_vertex->last_change >= 0 && e->terminal_vertex->last_change < 0)) {
+        cout << "Inconsistent non-connexity (this should never happen)." << endl;
+        abort();
+      }
+      if(e->origin_vertex->last_change >= 0 &&
+         e->terminal_vertex->last_change >= 0 &&
+         e->positivized_length < 0) {
+        residual_error -= e->positivized_length;
+        max_error = max(max_error, - e->positivized_length);
+      }
 #endif
       e->positivized_length = 0.0;
     }
@@ -218,8 +225,8 @@ 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) {
@@ -230,7 +237,7 @@ 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) {
@@ -245,7 +252,7 @@ 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() {
@@ -359,7 +366,7 @@ 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(); }
   }
 }
@@ -381,15 +388,19 @@ 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;
   }