Function std::thread::catch_panic

pub fn catch_panic<F, R>(f: F) -> Result<R> where F: FnOnce() -> R + Send + 'static

Unstable (catch_panic #27719)

: recent API addition

Invokes a closure, capturing the cause of panic if one occurs.

This function will return Ok with the closure's result if the closure does not panic, and will return Err(cause) if the closure panics. The cause returned is the object with which panic was originally invoked.

It is currently undefined behavior to unwind from Rust code into foreign code, so this function is particularly useful when Rust is called from another language (normally C). This can run arbitrary Rust code, capturing a panic and allowing a graceful handling of the error.

It is not recommended to use this function for a general try/catch mechanism. The Result type is more appropriate to use for functions that can fail on a regular basis.

The closure provided is required to adhere to the 'static bound to ensure that it cannot reference data in the parent stack frame, mitigating problems with exception safety. Furthermore, a Send bound is also required, providing the same safety guarantees as thread::spawn (ensuring the closure is properly isolated from the parent).

Examples

#![feature(catch_panic)] fn main() { use std::thread; let result = thread::catch_panic(|| { println!("hello!"); }); assert!(result.is_ok()); let result = thread::catch_panic(|| { panic!("oh no!"); }); assert!(result.is_err()); }

#![feature(catch_panic)]

use std::thread;

let result = thread::catch_panic(|| {
    println!("hello!");
});
assert!(result.is_ok());

let result = thread::catch_panic(|| {
    panic!("oh no!");
});
assert!(result.is_err());