From f0a69e09fcae8ff067854bc046fda308f7b4ced6 Mon Sep 17 00:00:00 2001
From: Jeremy Siek <jeremy.siek@gmail.com>
Date: Sun, 28 Jan 2001 02:25:44 +0000
Subject: [PATCH] added constructor requirement to MutableGraph

[SVN r8802]
---
 include/boost/graph/graph_concepts.hpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/boost/graph/graph_concepts.hpp b/include/boost/graph/graph_concepts.hpp
index f4fd3600..e23af49a 100644
--- a/include/boost/graph/graph_concepts.hpp
+++ b/include/boost/graph/graph_concepts.hpp
@@ -208,6 +208,7 @@ namespace boost {
   {
     typedef typename graph_traits<G>::edge_descriptor edge_descriptor;
     void constraints() {
+      G g(n_vertices);
       v = add_vertex(g);
       clear_vertex(v, g);
       remove_vertex(v, g);
@@ -220,6 +221,7 @@ namespace boost {
     std::pair<edge_descriptor, bool> p;
     typename graph_traits<G>::vertex_descriptor u, v;
     typename graph_traits<G>::out_edge_iterator iter;
+    typename graph_traits<G>::vertices_size_type n_vertices;
   };
 
   template <class edge_descriptor>