Compilation error when registering callbacks in openGL

I've just started learning openGL a couple of hours ago for my work and have been tasked with rendering a concave polygon using tessellation. I'm trying to compile the following code:

#ifndef CALLBACK
#define CALLBACK
#endif

#include "GL/gl.h"
#include "GL/glu.h"

void CALLBACK beginCallback(GLenum which);

void drawHook()
{
   GLUtesselator* tes开发者_C百科sObj = gluNewTess();
   gluTessCallback(tessObj, GLU_TESS_BEGIN, beginCallback);
}

void CALLBACK beginCallback(GLenum which)
{
    glBegin(which);
}

which I've gotten from the OpenGL Programming Guide, Seventh Edition, with the relevant chapter also being available online. But the following error is being returned:

hook.cc:28: error: invalid conversion from ‘void (*)(GLenum)’ to ‘void (*)()’
hook.cc:28: error: initializing argument 3 of ‘void gluTessCallback(GLUtesselator*, GLenum, void (*)())’

This error leads me to believe that the third argument of gluTessCallback should be a function that takes no arguments, yet the 'official' openGL reference states otherwise.

Am I missing something here or is the book incorrect?

---

The book is correct. You just have to cast the function pointer to void(*)(). It's needed because the type is not (and cannot be) precise.

gluTessCallback(tessObj, GLU_TESS_BEGIN, (void(*)())&beginCallback);

---

The documentation you linked states that the third argument of gluTessCallback is a parameterless function. (right after the heading Tessellation Callback Routines)

However, Example 11-1 casts the actual function pointer to a parameterless one:

gluTessCallback(tobj, GLU_TESS_ERROR, (GLvoid (*) ()) &errorCallback);
                                      ^^^^^^^^^^^^^^^