Changeset 883:dc376822c17d in lemon-main

Timestamp:

04/05/10 23:41:05 (15 years ago)

Author:

Peter Kovacs <kpeter@…>

Branch:

default

Phase:

public

Message:

Add an undirected() function (#364)

File:

• lemon/core.h (modified) (1 diff)

lemon/core.h

@@ -445 +445 @@
 
   }
+
+  /// Check whether a graph is undirected.
+  ///
+  /// This function returns \c true if the given graph is undirected.
+#ifdef DOXYGEN
+  template <typename GR>
+  bool undirected(const GR& g) { return false; }
+#else
+  template <typename GR>
+  typename enable_if<UndirectedTagIndicator<GR>, bool>::type
+  undirected(const GR&) {
+    return true;
+  }
+  template <typename GR>
+  typename disable_if<UndirectedTagIndicator<GR>, bool>::type
+  undirected(const GR&) {
+    return false;
+  }
+#endif
 
   /// \brief Class to copy a digraph.