Struct std::panic::PanicHookInfo

1.81.0 · source ·
pub struct PanicHookInfo<'a> { /* private fields */ }
Expand description

A struct providing information about a panic.

PanicHookInfo structure is passed to a panic hook set by the set_hook function.

§Examples

use std::panic;

panic::set_hook(Box::new(|panic_info| {
    println!("panic occurred: {panic_info}");
}));

panic!("critical system failure");

Implementations§

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impl<'a> PanicHookInfo<'a>

1.10.0 · source

pub fn payload(&self) -> &(dyn Any + Send)

Returns the payload associated with the panic.

This will commonly, but not always, be a &'static str or String.

A invocation of the panic!() macro in Rust 2021 or later will always result in a panic payload of type &'static str or String.

Only an invocation of panic_any (or, in Rust 2018 and earlier, panic!(x) where x is something other than a string) can result in a panic payload other than a &'static str or String.

§Examples
use std::panic;

panic::set_hook(Box::new(|panic_info| {
    if let Some(s) = panic_info.payload().downcast_ref::<&str>() {
        println!("panic occurred: {s:?}");
    } else if let Some(s) = panic_info.payload().downcast_ref::<String>() {
        println!("panic occurred: {s:?}");
    } else {
        println!("panic occurred");
    }
}));

panic!("Normal panic");
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pub fn payload_as_str(&self) -> Option<&str>

🔬This is a nightly-only experimental API. (panic_payload_as_str #125175)

Returns the payload associated with the panic, if it is a string.

This returns the payload if it is of type &'static str or String.

A invocation of the panic!() macro in Rust 2021 or later will always result in a panic payload where payload_as_str returns Some.

Only an invocation of panic_any (or, in Rust 2018 and earlier, panic!(x) where x is something other than a string) can result in a panic payload where payload_as_str returns None.

§Example
#![feature(panic_payload_as_str)]

std::panic::set_hook(Box::new(|panic_info| {
    if let Some(s) = panic_info.payload_as_str() {
        println!("panic occurred: {s:?}");
    } else {
        println!("panic occurred");
    }
}));

panic!("Normal panic");
1.10.0 · source

pub fn location(&self) -> Option<&Location<'_>>

Returns information about the location from which the panic originated, if available.

This method will currently always return Some, but this may change in future versions.

§Examples
use std::panic;

panic::set_hook(Box::new(|panic_info| {
    if let Some(location) = panic_info.location() {
        println!("panic occurred in file '{}' at line {}",
            location.file(),
            location.line(),
        );
    } else {
        println!("panic occurred but can't get location information...");
    }
}));

panic!("Normal panic");
source

pub fn can_unwind(&self) -> bool

🔬This is a nightly-only experimental API. (panic_can_unwind #92988)

Returns whether the panic handler is allowed to unwind the stack from the point where the panic occurred.

This is true for most kinds of panics with the exception of panics caused by trying to unwind out of a Drop implementation or a function whose ABI does not support unwinding.

It is safe for a panic handler to unwind even when this function returns false, however this will simply cause the panic handler to be called again.

Trait Implementations§

1.81.0 · source§

impl<'a> Debug for PanicHookInfo<'a>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
1.26.0 · source§

impl Display for PanicHookInfo<'_>

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fn fmt(&self, formatter: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

Auto Trait Implementations§

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impl<'a> Freeze for PanicHookInfo<'a>

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impl<'a> !RefUnwindSafe for PanicHookInfo<'a>

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impl<'a> !Send for PanicHookInfo<'a>

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impl<'a> !Sync for PanicHookInfo<'a>

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impl<'a> Unpin for PanicHookInfo<'a>

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impl<'a> !UnwindSafe for PanicHookInfo<'a>

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToString for T
where T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.