use std::any::Any;
use std::cell::RefCell;
thread_local!(static LAST_ERROR: RefCell<Option<Box<Any + Send>>> = {
RefCell::new(None)
});
#[cfg(feature = "unstable")]
pub fn wrap<T, F: FnOnce() -> T + ::std::panic::UnwindSafe>(f: F) -> Option<T> {
use std::panic;
if LAST_ERROR.with(|slot| slot.borrow().is_some()) {
return None
}
match panic::catch_unwind(f) {
Ok(ret) => Some(ret),
Err(e) => {
LAST_ERROR.with(move |slot| {
*slot.borrow_mut() = Some(e);
});
None
}
}
}
#[cfg(not(feature = "unstable"))]
pub fn wrap<T, F: FnOnce() -> T>(f: F) -> Option<T> {
struct Bomb {
enabled: bool,
}
impl Drop for Bomb {
fn drop(&mut self) {
if !self.enabled {
return
}
panic!("callback has panicked, and continuing to unwind into C \
is not safe, so aborting the process");
}
}
let mut bomb = Bomb { enabled: true };
let ret = Some(f());
bomb.enabled = false;
ret
}
pub fn check() {
let err = LAST_ERROR.with(|slot| slot.borrow_mut().take());
if let Some(err) = err {
panic!(err)
}
}
pub fn panicked() -> bool {
LAST_ERROR.with(|slot| slot.borrow().is_some())
}