[Boost-users] function/bind - passing function pointer to C API

From: Nicholas Yue (yue.nicholas_at_[hidden])
Date: 2007-08-15 21:19:11

Hi,

    I am attempting to use Boost bind and function to help me pass a member
function as a function pointer to the GLUT C-library.

  I have difficulty understanding the usage of bind and function in the
Boost library. When I attempt to pass what I thought was a function pointer,
the compiler indicated that it is actually not a function pointer.

class MyGlut {
public:
  MyGlut();
  virtual ~MyGlut();
  void loop(int argc, char **argv);
  void draw(void);
  void displayFunc(boost::function<void()> func);
private:
  boost::function<void()> display_callback;
};

void MyGlut::displayFunc(boost::function<void()> func)
{
  glutDisplayFunc(func); // ERROR IN COMPILATION
}

void MyGlut::loop(int argc, char **argv)
{
  glutInit(&argc,argv);
  glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH |
GLUT_MULTISAMPLE);
  glutCreateWindow("Hello World");

  //glutDisplayFunc(redraw); // Original way to pass C-function pointer
  displayFunc( boost::bind(&MyGlut::draw, *this) );

}

Regards