Function relay_ffi::with_last_error

pub fn with_last_error<R, F>(f: F) -> Option<R>
where
    F: FnOnce(&Error) -> R,

Acquires a reference to the last error and passes it to the callback, if any.

Returns Some(R) if there was an error, otherwise None. The error resets when it is taken with take_last_error.

Example

use relay_ffi::{catch_unwind, with_last_error};

#[catch_unwind]
unsafe fn run_ffi() -> i32 {
    "invalid".parse()?
}

let parsed = unsafe { run_ffi() };
match with_last_error(|e| e.to_string()) {
    Some(error) => println!("errored with: {error}"),
    None => println!("result: {parsed}"),
}