Trait unwind_context::PanicDetector

pub trait PanicDetector {
    // Required method
    fn is_panicking(&self) -> bool;
}

An utility trait which is used to detect panic.

Examples

use core::sync::atomic::{self, AtomicBool};

use unwind_context::unwind_context_with_fmt;

#[derive(Copy, Clone, Debug)]
pub struct NoStdPanicFlag<'a>(&'a AtomicBool);

impl unwind_context::PanicDetector for NoStdPanicFlag<'_> {
    fn is_panicking(&self) -> bool {
        self.0.load(atomic::Ordering::Relaxed)
    }
}

fn func(foo: u32, bar: &str, writer: &mut String, panic_flag: NoStdPanicFlag<'_>) {
    let ctx =
        unwind_context_with_fmt!((foo, bar), writer = writer, panic_detector = panic_flag,);
    // ...
}

Required Methods

fn is_panicking(&self) -> bool

Determines whether the current thread is unwinding because of panic.

Panics

Implementations should generally avoid panic!ing, because is_panicking() may itself be called during unwinding due to a panic, and if the is_panicking() panics in that situation (a “double panic”), this will likely abort the program.

Implementors

impl PanicDetector for StdPanicDetector

Available on crate feature std only.