[LC++]limiting paramter-type of parameterized class

[Julien Patrick Claassen]

Hello all!
  I'm writing a command-class. A command is a string, which is related to
a function, which can be specified by the user. So it looks like that:

template <class T>
class Cmd : public String
  public:
  ...
private:
  T function;
};

I want to write it using a template, but I want to garantee, that T is
something like:
<return-type> (*typename)(arg-list)
i.e.
int (*intfunc)()

What can I do to restrict the user to be conform with this idea?
  Thanks for any proposals. I need a way using normal c++ and no extra
classes.
  Kindest regards
          Julien

Julien Patrick Claassen
jclaassen at gmx.de
julien at c-lab.de
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