Trait 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.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl PanicDetector for StdPanicDetector

Available on crate feature std only.