use std::cell::UnsafeCell;
use std::ptr;
use super::StrongPtr;
use crate::runtime::{self, Object};
pub struct WeakPtr(Box<UnsafeCell<*mut Object>>);
impl WeakPtr {
pub unsafe fn new(obj: *mut Object) -> Self {
let ptr = Box::new(UnsafeCell::new(ptr::null_mut()));
runtime::objc_initWeak(ptr.get(), obj);
WeakPtr(ptr)
}
pub fn load(&self) -> StrongPtr {
unsafe {
let ptr = runtime::objc_loadWeakRetained(self.0.get());
StrongPtr::new(ptr)
}
}
}
impl Drop for WeakPtr {
fn drop(&mut self) {
unsafe {
runtime::objc_destroyWeak(self.0.get());
}
}
}
impl Clone for WeakPtr {
fn clone(&self) -> Self {
let ptr = Box::new(UnsafeCell::new(ptr::null_mut()));
unsafe {
runtime::objc_copyWeak(ptr.get(), self.0.get());
}
WeakPtr(ptr)
}
}