From d56e2dcca3398ca7a2b391c1af5385a9759119cb Mon Sep 17 00:00:00 2001
From: Jeremy Siek <jeremy.siek@gmail.com>
Date: Mon, 9 Jul 2001 14:10:56 +0000
Subject: [PATCH] removed use of color_vec[0] to avoid problems when
 num_vertices(g) == 0

[SVN r10572]
---
 include/boost/graph/depth_first_search.hpp | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/include/boost/graph/depth_first_search.hpp b/include/boost/graph/depth_first_search.hpp
index b5eda532..d91dddbe 100644
--- a/include/boost/graph/depth_first_search.hpp
+++ b/include/boost/graph/depth_first_search.hpp
@@ -138,11 +138,12 @@ namespace boost {
 	    detail::error_property_not_found)
       {
 	std::vector<default_color_type> color_vec(num_vertices(g));
+	default_color_type c;
 	dfs_impl(g, vis,
 		 make_iterator_property_map
-		 (color_vec.begin(), 
-		  choose_const_pmap(get_param(params, vertex_index), 
-				    g, vertex_index), color_vec[0]) );
+		 (color_vec.begin(),
+		  choose_const_pmap(get_param(params, vertex_index),
+				    g, vertex_index), c) );
       }
     };