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Graphs with zero vertices have zero connected components

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[SVN r26403]
This commit is contained in:
Douglas Gregor
2004-12-02 16:32:05 +00:00
parent 604e5a7a45
commit 30ef8f84ff
1 changed files with 4 additions and 0 deletions
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4
include/boost/graph/connected_components.hpp
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@@ -76,6 +76,8 @@ namespace boost {
connected_components(const Graph& g, ComponentMap c,
const bgl_named_params<P, T, R>& params)
{
if (num_vertices(g) == 0) return 0;
typedef typename graph_traits<Graph>::vertex_descriptor Vertex;
function_requires< WritablePropertyMapConcept<ComponentMap, Vertex> >();
typedef typename boost::graph_traits<Graph>::directed_category directed;
@@ -93,6 +95,8 @@ namespace boost {
inline typename property_traits<ComponentMap>::value_type
connected_components(const Graph& g, ComponentMap c)
{
if (num_vertices(g) == 0) return 0;
typedef typename graph_traits<Graph>::vertex_descriptor Vertex;
function_requires< WritablePropertyMapConcept<ComponentMap, Vertex> >();
typedef typename boost::graph_traits<Graph>::directed_category directed;