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

30 Jun 2006

      I have a main file from my OpenGL program which contains global
variables and the functions that are used by OpenGL as callback
functions. For example:

        int a;
        float b;

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

        int main (int argc, char **argv)
        {
        	    glutDisplayFunc( display );
        }

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 );
        }

What I am getting back from the g++ compiler is the following error message:

error: cannot convert `boost::function<void ()(), std::allocator<void> >' to `void (*)()' for argument `1' to `void glutDisplayFunc(void (*)())'

Any ideas where I am going wrong?

Stephen

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

Stephen Torri