const-correctness bug in sparse_ordering.hpp

[Dave Abrahams]

Did this code even get tested? Or am I on crack to think that it's wrong?

This patch fixes it for my particular test case.

sparse_ordering.hpp

@@ -128 +128 @@
   //
   template <class Graph, class Vertex, class ColorMap, class DegreeMap>
   Vertex 
-  pseudo_peripheral_pair(Graph& G, const Vertex& u, int& ecc,
+  pseudo_peripheral_pair(Graph const& G, const Vertex& u, int& ecc,
                          ColorMap color, DegreeMap degree)
   {
     typedef typename property_traits<ColorMap>::value_type ColorValue;
@@ -152 +152 @@
   // of the ordering generated by RCM.
   //
   template <class Graph, class Vertex, class Color, class Degree> 
-  Vertex find_starting_node(Graph& G, Vertex r, Color color, Degree degree)
+  Vertex find_starting_node(Graph const& G, Vertex r, Color color, Degree degree)
   {
     Vertex x, y;
     int eccen_r, eccen_x;

[Jeremiah Willcock]

(In [50823]) Applied patch from #2132, closes #2132