Changeset 514:41bdb4d6c8c3 in lemon-main

Timestamp:

10/12/09 13:41:15 (15 years ago)

Author:

Peter Kovacs <kpeter@…>

Branch:

default

Children:

516:c6acc34f98dc, 751:f5f260a63a9b

Phase:

public

Message:

Fix in pathSource() and pathTarget() (#250)
and extend the doc.

File:

• lemon/path.h (modified) (1 diff)

lemon/path.h

@@ -1016 +1016 @@
   /// \brief The source of a path
   ///
-  /// This function returns the source of the given path.
+  /// This function returns the source node of the given path.
+  /// If the path is empty, then it returns \c INVALID.
   template <typename Digraph, typename Path>
   typename Digraph::Node pathSource(const Digraph& digraph, const Path& path) {
-    return digraph.source(path.front());
+    return path.empty() ? INVALID : digraph.source(path.front());
   }
 
   /// \brief The target of a path
   ///
-  /// This function returns the target of the given path.
+  /// This function returns the target node of the given path.
+  /// If the path is empty, then it returns \c INVALID.
   template <typename Digraph, typename Path>
   typename Digraph::Node pathTarget(const Digraph& digraph, const Path& path) {
-    return digraph.target(path.back());
+    return path.empty() ? INVALID : digraph.target(path.back());
   }