1 unstable release
0.1.0 | Nov 21, 2023 |
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#6 in #downstream
4KB
precompile
precompile
is a nightly-only crate that uses #![feature(specialization)]
for precompiling specific monomorphizations of a generic function.
This can provide a benefit for generic functions that are expected to be used
with a limited set of types from multiple downstream crates.
For example:
// crate: A
pub fn generic_fn<T>() {
// ...
}
// crate B
A::generic_fn::<u32>();
// crate C
A::generic_fn::<u32>();
This code will usually compile A::generic_fn::<u32>
twice.
Whereas if we precompile generic_fn
:
// crate: A
#[precompile::precompile]
#[precompile_with(u32)]
pub fn generic_fn<T>() {
// ...
}
Then no matter how many crates use A::generic_fn::<u32>
, it will only be
compiled once, when the crate A
is built.
This means a possibly larger upfront compile-time cost for building A
, in exchange for
a cheaper monomorphization cost when used downstream.
Dependencies
~260–710KB
~17K SLoC