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

On 6/30/06, Stephen Torri wrote:

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 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' to `void (*)()' for argument `1' to `void glutDisplayFunc(void (*)())'

Any ideas where I am going wrong?

You are passing a function object to a C function which expects a function pointer. A boost::function can not be converted into a function pointer.

Stephen

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