GLFW simple event handler

I wrote a simple concept of an event system in cpp. It is uses a namespace and a global state, but normally a global state with namespaces is bad practice.

Is there a better way to do simple event handling with multiple callback functions?

header:

#ifndef EVENTS_EVENTMANAGER_H
#define EVENTS_EVENTMANAGER_H
#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include <vector>
#include <functional>

namespace eventmanager
{   

    //resize event
    static std::vector<std::function<void(GLFWwindow*, int, int)>> resizeEventCallbacks;
    void resizeEvent(GLFWwindow *window, int width, int hight);
    void subscribeResize(std::function<void(GLFWwindow*, int, int)> callback);
}

#endif //EVENTS_EVENTMANAGER_H

cpp:

#include "events/eventmanager.h"

void eventmanager::resizeEvent(GLFWwindow *window, int width, int hight)
{
    for (auto &callback: eventmanager::resizeEventCallbacks)
    {
        callback(window, width, hight);
    }
}

void eventmanager::subscribeResize(std::function<void(GLFWwindow *, int, int)> callback)
{
    eventmanager::resizeEventCallbacks.push_back(callback);
}

usage:

eventmanager::subscribeResize([&](GLFWwindow *window, int width, int hight) {
            ...

            });