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Using GLUT in an Object Oriented Program
#ifndef MCVIEWER_H__
#define MCVIEWER_H__

#include <cstdlib>
#include <ctime>
#include <stdlib.h>
#include <string>
#include <math.h>
#include <iostream>
#include <assert.h>
#include <GLUT/GLUT.h>

class MCViewer {
    //MCViewer declarations, implementation specified in corresponding .cpp
};

extern MCViewer *currRef;

extern "C" {
    static void displayFcnCB(void) {
        currRef->displayFcn();
    }

    static void winReshapeFcnCB(GLint newWidth, GLint newHeight) {
        currRef->winReshapeFcn(newWidth, newHeight);
    }

    static void keyboardActionCB(GLubyte key, GLint xMouse, GLint yMouse) {
        currRef->keyboardAction(key, xMouse, yMouse);
    }
}

#endif //MCVIEWER_H__

extern MCViewer *currRef;

extern "C" {
    static void displayFcnCB(void) {
        currRef->displayFcn();
    }