You need something like std::mem_fun. Have you looked
at Boost
(
http://www.boost.org)? I think boost::mem_fn will do what you want.
Unfortunately that won't work. std::mem_fun and boost::mem_fn create
functors which can be used with STL algorithms and the like, but are
completely different from C functions (or function pointers). The way
they are used looks similar, but it's not the same thing.
There simply is no pretty solution to this problem, you'll have to use
a global (or static member) function in some way...
You could also cobble something together on your own.
If your
Midish_rl class is a singleton (i.e. you only allocate one object of
that type in you program), you could add some static wrapper methods.
Otherwise, write your own member function adapters classes specific to
your situation.