2 unstable releases
0.2.0 | Oct 18, 2022 |
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0.1.2 | Oct 11, 2022 |
0.1.1 |
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0.1.0 |
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#10 in #ok
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8KB
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tryvial
A small crate for Ok-wrapping and try blocks.
This is compatible with Result
, Option
,
and any type implementing the unstable std::ops::Try
trait.
This crate does not require nightly Rust.
Overview
The macro try_fn
is used to perform Ok-wrapping on the return value of a function.
Before:
fn main() -> Result<(), Box<dyn std::error::Error>> {
println!("Enter your name: ");
let mut name = String::new();
std::io::stdin().read_line(&mut name)?;
println!("Hello, {name}!");
Ok(()) // this is ugly
}
After:
#[try_fn]
fn main() -> Result<(), Box<dyn std::error::Error>> {
println!("Enter your name: ");
let mut name = String::new();
std::io::stdin().read_line(&mut name)?;
println!("Hello, {name}!");
}
The macro try_block
is an implementation of "try blocks" from nightly rust.
let result: Result<T, E> = try_block! {
let a = do_one(x)?;
let b = do_two(a)?;
b
};
The macro wrap_ok
simply wraps an expression with the "ok" variant for a given Try
type.
assert_eq!(Some(42), wrap_ok!(42));
License
MIT or Apache-2.0
Dependencies
~42KB