2 releases
0.1.1 | Oct 24, 2024 |
---|---|
0.1.0 | Oct 24, 2024 |
#568 in Data structures
249 downloads per month
13KB
173 lines
Stable, no_std
-compatible, fallible heap allocation for [Box
].
Basic usage is as follows:
match trybox::new(1) {
Ok(heaped) => {
let _: Box<i32> = heaped;
}
Err(ErrorWith(stacked)) => {
let _: i32 = stacked; // failed object is returned on the stack
},
}
You may drop the object after allocation failure instead,
choosing to e.g propogate or wrap the Error
.
fn fallible<T>(x: T) -> Result<Box<T>, Box<dyn std::error::Error + Send + Sync>> {
Ok(trybox::or_drop(x)?)
}
Care has been taken to optimize the size of Error
down to a single usize:
assert_eq!(size_of::<trybox::Error>(), size_of::<usize>());
And to provide ergonomic error messages:
memory allocation of 4 bytes (for type i32) failed
memory allocation of 2.44 kibibytes (for type [u8; 2500]) failed
Conversions to std::io::Error
and std::io::ErrorKind::OutOfMemory
are provided when the "std"
feature is enabled:
fn fallible<T>(x: T) -> std::io::Result<Box<T>> {
Ok(trybox::or_drop(x)?)
}
Comparison with other crates
fallacy-box
fallible_collections
- You must use either the
TryBox
wrapper struct, or theFallibleBox
extension trait. - The returned error type doesn't implement common error traits, and isn't strictly minimal.
- You must use either the
Dependencies
~22KB