Struct std::panic::PanicHookInfo
1.81.0 · source · pub struct PanicHookInfo<'a> { /* private fields */ }
Expand description
Implementations§
source§impl<'a> PanicHookInfo<'a>
impl<'a> PanicHookInfo<'a>
1.10.0 · sourcepub fn payload(&self) -> &(dyn Any + Send)
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");
sourcepub fn payload_as_str(&self) -> Option<&str>
🔬This is a nightly-only experimental API. (panic_payload_as_str
#125175)
pub fn payload_as_str(&self) -> Option<&str>
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 · sourcepub fn location(&self) -> Option<&Location<'_>>
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");
sourcepub fn can_unwind(&self) -> bool
🔬This is a nightly-only experimental API. (panic_can_unwind
#92988)
pub fn can_unwind(&self) -> bool
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.