1 unstable release
0.1.0 | Sep 27, 2021 |
---|
#9 in #maybe
27 downloads per month
Used in 3 crates
18KB
281 lines
maybe-debug
Implement Debug
for anything via specialization.
Lets say you have the following function and you want
to insert a dbg!()
statement inside the loop.
fn sort<T>(target: &mut [T]) {
for (i, val) in target.iter().enumerate() {
dbg!(i);
// various sorting goodness
dbg!(i, val); // ERROR: T is not Debug
}
}
You can use maybe_debug::maybe_debug()
to work around this.
If T
is Debug
it will 'cast' it. If T
is !Debug, it will
fallback to a reasonable default (printing the type name).
fn sort<T>(target: &mut [T]) {
for (i, val) in target.iter().enumerate() {
maybe_debug::dbg!(i);
// various sorting goodness
maybe_debug::dbg!(i, val); // On nightly, will specialize if 'T: Debug'
}
}
This has a fallback to work on stable Rust (without specialization).
In that case, the "cast" always fails and maybe_debug
will unconditionally
use the fallback.