Template class inheriting a templated class

[frei]

Hey everyone!
I'm hoping someone can point out what I'm doing wrong, I'm completely stuck. I'm making a minimal spanning tree class that inherits a graph class, both are templated.
This is my mstree.h so far:

#ifndef _MSTREE_H_
#define _MSTREE_H_

#include "graph.h"

namespace MSTreeNameSpace
{
  template <class T>
  class MSTREE : public Graph<T>
  {
  public:
    MSTREE(Graph); // constructor
    ~MSTREE(); 
    void output();
  };
};

and I keep getting these errors:

mst.h:9:25: error: expected template-name before ‘<’ token
class MST : public Graph<T>
^
mst.h:9:25: error: expected ‘{’ before ‘<’ token
mst.h:9:25: error: expected unqualified-id before ‘<’ token

Any help would be greatly appreciated!

[JLBorges]

Is the name Graph at namespace scope either in the global namespace or in the namespace MSTreeNameSpace?

[frei]

I can't believe I forgot to add the GraphNameSpace:

#include "graph.h"

using namespace GraphNameSpace;
namespace MSTNameSpace

It's working great now.
Thanks for the help!!

[JLBorges]

using namespace GraphNameSpace; // **** avoid at global namespace scope, particularly in a header.

Favour one of these:

namespace MSTreeNameSpace
{
     using namespace GraphNameSpace ;
     // ... 

Or (better)

namespace MSTreeNameSpace
{
     using GraphNameSpace::Graph ;
     // ... 

Or (best)

namespace MSTreeNameSpace
{
    template <class T>
    class MSTREE : public GraphNameSpace::Graph<T>     // ... 

If we (ie. non-Redmond, non-Hungarian people) don't name a double holding the maximum temperature as either max_temperature_double or worse, double_max_temperature, should we name a namespace containing graph utilities as GraphNameSpace?