# Function std::panic::take_hook 1.10.0[−][src]

ⓘImportant traits for Box<I>

### Important traits for Box<I>

`impl<I> Iterator for Box<I> where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<R: Read + ?Sized> Read for Box<R>impl<W: Write + ?Sized> Write for Box<W>`

    pub fn take_hook() -> Box<Fn(&PanicInfo) + Sync + Send + 'static>

Unregisters the current panic hook, returning it.

See also the function `set_hook`.

If no custom hook is registered, the default hook will be returned.

# Panics

Panics if called from a panicking thread.

# Examples

The following will print "Normal panic":

    use std::panic;

    panic::set_hook(Box::new(|_| {
        println!("Custom panic hook");
    }));

    let _ = panic::take_hook();

    panic!("Normal panic");Run

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