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// A lifetime-managed wrapper for callback functions
#[derive(Debug, PartialEq)]
pub struct BoxedCallback<T>(*mut Box<dyn FnMut(&T)>);
impl<T> BoxedCallback<T> {
pub fn new<F: FnMut(&T) + Send + 'static>(f: F) -> BoxedCallback<T> {
BoxedCallback(Box::into_raw(Box::new(Box::new(f))))
}
pub fn null() -> BoxedCallback<T> {
BoxedCallback(::std::ptr::null_mut())
}
pub fn raw_ptr(&mut self) -> *mut ::std::os::raw::c_void {
self.0 as *mut ::std::os::raw::c_void
}
// must not be null
pub unsafe fn call_from_raw_ptr(raw_ptr: *mut ::std::os::raw::c_void, arg: &T) {
let callback = &mut *(raw_ptr as *mut Box<dyn FnMut(&T)>);
callback(arg);
}
}
unsafe impl<T> Send for BoxedCallback<T> {}
impl<T> Drop for BoxedCallback<T> {
fn drop(&mut self) {
if !self.0.is_null() {
unsafe {
let _ = Box::from_raw(self.0);
}
}
}
}