SDL Style Question

[henryswanson]

I'm not sure if this should go here or in the graphics forum, but it's mostly a C++ style question. In my main function, I create a pointer to one instance of a class I made (representing a window). Is it acceptable to have this pointer be global? Otherwise I have to pass it to all the functions in main.cpp. In addition, do I use const in this case? Here's the code, if it helps.

main.h:

#include <iostream>
#include <string>

#include "SDL/SDL.h"
#include "SDL/SDL_image.h"
#include "SDL/SDL_ttf.h"

#include "card.h"
#include "table.h"

using namespace std;

Window* gameWindow = NULL;   //Here's the global I'm unsure about

int main(int argc, char** argv);

bool init();

int handleEvents();
int handleLogic();
int handleDisplay();

void cleanup();

main.cpp:

#include "main.h"

/** Main... duh */
int main(int argc, char* argv[]) {
    if(!init()) return -1;

    int runningCode = 0; //anything else signifies error
    while(runningCode == 0) {
        runningCode = handleEvents();
        if(runningCode != 0) break;
        runningCode = handleLogic();
        if(runningCode != 0) break;
        runningCode = handleDisplay();
    }

    cleanup();
    return 0;
}

/** Initializes SDL and the Window object */
bool init() {
    if(SDL_Init(SDL_INIT_EVERYTHING) == -1) return false;
    gameWindow = new Window();
    return true;
}

int handleEvents() {
    SDL_Event event;
    while(SDL_PollEvent(&event)) {
        //TODO
    }
}

int handleLogic() {
    //TODO
}

int handleDisplay() {
    //TODO
}

void cleanup() {
    delete gameWindow;
}