4 stable releases
Uses old Rust 2015
1.2.1 | Nov 24, 2019 |
---|---|
1.1.0 | Jun 27, 2018 |
1.0.1 | Jun 11, 2018 |
1.0.0 | Jun 10, 2018 |
#1569 in Rust patterns
69 downloads per month
Used in 4 crates
(2 directly)
11KB
121 lines
matches2
This is a fork of the matches crate with an extra unwrap_match!
and option_match!
macro,
and also better error messages for assert_matches
.
unwrap_match!
macro
The unwrap_match!
macro is a general unwrap, used as such:
let output = unwrap_match!(input, AnEnum::Variant(a) | AnEnum::OtherVariant(a) if a < 5 * 2 => a);
If it fails, it emits a descriptive error including the pattern and the input,
for this reason input
must implement Debug
, unless you provide a custom error message
as the last arguments, in the same way you'd use format!
.
option_match!
macro
The option_match!
macro is like unwrap_match!
, except instead of failing,
it just returns an Option
.
let output: Option<_> = option_match!(input, AnEnum::Variant(a) | AnEnum::OtherVariant(a) if a < 5 * 2 => a);
Error message improvements
The original matches crate would emit horrible errors when assertions failed,
outputting a pattern such as Some(_)
as Some ( _ )
. This version has properly
formatted errors, so you will never experience this again.