Re: [Boost-users] Replacing C functions with boost::function for callback functions in OpenGL

From: Baranowski, Daniel (dbaranowski_at_[hidden])
Date: 2006-06-30 16:04:29

[snip]
> Now I thought I would put all the variables and functions into a class
> and use that in the main. Here is where I am getting stuck on the use
of
> boost::function. I changed the code to look something like the
> following:
> 
>         class MyMain {
>         	int a;
>         	float b;
> 
>         	void display()
>         	{
>         		... display code calls ...
>         	}
>         }
> 
>         int main (int argc, char **argv)
>         {
>         	MyMain m_ref;
>         	boost::function<void()> disp_func = boost::bind (
> &MyMain::display, &m_ref );
>         	glutDisplayFunc ( disp_func );
>         }
[snip]

Maybe you could leave the display function as it was before, have OpenGL
call that function, and then have Display call disp_func().

Something like this (though I haven't actually tried it):

        typedef boost::function<void()> DisplayFuncType;
        DisplayFuncType CurrentDisplayObject;

        class MyMain {
                int a;
                float b;

                void display()
                {
                        ... display code calls ...
                }
        }

        void display ()
        {
                if(!CurrentDisplayObject.empty())
                   CurrentDisplayObject();
        }

        int main (int argc, char **argv)
        {
                MyMain m_ref;
                CurrentDisplayObject = boost::bind ( &MyMain::display,
&m_ref );
                glutDisplayFunc (display);
        }

Let me know if that works out for you! I'd be interested to know. I
think that's a good idea, BTW.

Daniel
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