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use std::marker::PhantomData;use graffiti_glfw::*;use std::ffi::CStr;use std::os::raw::{c_char, c_int};use std::rc::Rc;
pub struct App {    // !Send, !Sync    _marker: PhantomData<*mut ()>,}
impl App {    pub unsafe fn init() -> Rc<Self> {        assert_eq!(glfwInit(), GLFW_TRUE);
        glfwSetErrorCallback(handle_glfw_error);
        Rc::new(Self {            _marker: PhantomData,        })    }
    pub fn poll_events(&self) {        unsafe { glfwPollEvents() }    }
    pub fn wait_events(&self) {        unsafe { glfwWaitEvents() }    }
    pub fn wait_events_timeout(&self, timeout: f64) {        unsafe { glfwWaitEventsTimeout(timeout) }    }
    pub fn wake_up() {        unsafe { glfwPostEmptyEvent() }    }}
impl Drop for App {    fn drop(&mut self) {        unsafe { glfwTerminate() }    }}
unsafe extern "C" fn handle_glfw_error(code: c_int, desc: *const c_char) {    eprintln!("GLFW error {} {:?}", code, CStr::from_ptr(desc));}