macro_rules! try_map_err {
($result:expr, |$err:pat_param| $closure:expr) => { ... };
}
Expand description
An analog to Result::map_err
followed by a ?
but without a closure.
use macro_map::try_map_err;
fn myfn() -> Result<(), i64> {
let myresult: Result<&str, &str> = Err("hello");
try_map_err!(myresult, |myerr| 123);
Ok(())
}
let mapped = myfn();
assert_eq!(mapped, Err(123));
Or with postfix-macros
:
use macro_map::try_map_err;
use postfix_macros::postfix_macros;
fn myfn() -> Result<(), i64> {
postfix_macros! {
let myresult: Result<&str, &str> = Err("hello");
myresult.try_map_err!(|myerr| 123);
Ok(())
}
}
let mapped = myfn();
assert_eq!(mapped, Err(123));