Merge pull request #5 from BenPope/develop

Fix [un]directed_graph::swap and add tests

Nice job, thanks!  I'll have to look at your other points a bit more carefully before responding.

include/boost/graph/directed_graph.hpp

@@ -307,7 +307,7 @@ public:
 
     void swap(directed_graph& g)
     {
-        m_graph.swap(g);
+        m_graph.swap(g.m_graph);
         std::swap(m_num_vertices, g.m_num_vertices);
         std::swap(m_max_vertex_index, g.m_max_vertex_index);
         std::swap(m_num_edges, g.m_num_edges);

include/boost/graph/undirected_graph.hpp

@@ -294,7 +294,7 @@ public:
     }
 
     void swap(undirected_graph& g) {
-        m_graph.swap(g);
+        m_graph.swap(g.m_graph);
         std::swap(m_num_vertices, g.m_num_vertices);
         std::swap(m_max_vertex_index, g.m_max_vertex_index);
         std::swap(m_num_edges, g.m_num_edges);

test/Jamfile.v2

@@ -79,6 +79,7 @@ test-suite graph_test :
     [ run adjacency_matrix_test.cpp ]
     [ compile vector_graph_cc.cpp ]
     [ compile copy.cpp ]
+    [ compile swap.cpp ]
     [ compile property_iter.cpp ]
     [ run bundled_properties.cpp ]
     [ run floyd_warshall_test.cpp ]

test/swap.cpp

@@ -0,0 +1,21 @@
+// Copyright (C) Ben Pope 2014.
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#include <boost/graph/directed_graph.hpp>
+#include <boost/graph/undirected_graph.hpp>
+
+template<typename Graph>
+void test_member_swap()
+{
+  Graph lhs, rhs;
+  lhs.swap(rhs);
+}
+
+int main()
+{
+    test_member_swap<boost::adjacency_list<> >();
+    test_member_swap<boost::directed_graph<> >();
+    test_member_swap<boost::undirected_graph<> >();
+}