[Boost-users] Changing name of function being called in a template

From: James Hughes (JHughes_at_[hidden])
Date: 2006-04-11 05:14:12

Hello all,

I have a feeling this may be off the topic of Boost, so if anyone can point
me in the direction of a better place to ask please do (a templates mailing
list?). However, I post it here because I think Boost::Bind does something
similar internally to what I want to do, so someone may be able to advise.

I have a couple of templated class which implement a simple observer pattern
(yes I know Boost has signals, but it's not thread safe).

It uses a virtual function to make a call in to the observer from the
subject. My own observer then derive from this class and implement the
notify function. However, I would like to 'template' the name of the
function, so that different instances of the template can make calls to
different named function.

Now in Boost:bind you specify the name of the function in the class to be
called, but I don't know how to implement that in my own template class.

class observer<typename T>
{
virtual void Notify(T&);	// This is the function I want to rename
according to the template
}

so I might want, in a different instance, the Notify function to be called,
Shutdown(). Following code is NOT valid C++, but gives an idea of what I am
trying to implement, but don't know enough yet to do so!!

class observer<typename T, typename functionname>
{
virtual void <functionname>(T&)
}

Is there a way I can use templates to do this? Boost:bind can call a
particular member function passed in as part of the template defn, how do I
that?

I hope that is vaguely clear...

James