Crate try_all

Rust iterator extensions to operate on Results effectively.

try_map_all

and try_map_all_opt

Applies a closure on all items of the iterator until one fails (or all succeed).

fn all_numbers_x2(strs: &Vec<&str>) -> Result<Vec<u64>, std::num::ParseIntError> {
	Ok(strs.iter().try_map_all(|s| Ok(s.parse::<u64>()?*2))?.collect())
}

Respectively, for Options:

fn not_zero(is: Vec<u64>) -> Option<Vec<u64>> {
	Some(is.into_iter().try_map_all_opt(|i| if i > 0 { Some(i) } else { None })?.collect())
}

Note: once #42327 is merged, try_map_all will be implemented* under one name for all try types.

try_all

Tries all items of the iterator until one fails (or all succeed).

fn parse_all_numbers(strs: &Vec<&str>) -> Result<Vec<u64>, std::num::ParseIntError> {
	Ok(strs.iter().map(|s| s.parse()).try_all()?.collect())
}

Traits

TryAll	Trait providing try extensions to Iterators.
TryAllHack	A hack trait to bypass limitations of type checker.
TryMapAll	Trait providing try map (result) extensions to Iterators.
TryMapAllOption	Trait providing try map (option) extensions to Iterators.