12 releases (6 breaking)
0.7.4 | Aug 31, 2024 |
---|---|
0.7.3 | Aug 1, 2022 |
0.7.1 | Jul 4, 2022 |
0.4.1 | Dec 10, 2021 |
0.1.0 | Apr 26, 2021 |
#279 in Development tools
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Used in 2 crates
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SLoC
🧬 FnMeta
Returns metadata about a function at runtime.
Currently this includes the TypeId
s of function parameters.
This includes a FnMetadata
struct and FnMetadataExt
trait. FnMetadataExt
adds the .metadata()
function on functions and closures to return a FnMetadata
, whose implementation returns function metadata at runtime.
Usage
Add the following to Cargo.toml
fn_meta = "0.7.3"
# or
fn_meta = { version = "0.7.3", features = ["fn_meta_ext"] }
Code:
use core::any::TypeId;
use fn_meta::{FnMetaDyn, FnMetadataExt};
fn f1(_: &S0, _: &mut S1, _: &S2) -> () {}
let fn_metadata = f1.metadata();
assert_eq!(
[TypeId::of::<S0>(), TypeId::of::<S2>()],
fn_metadata.borrows().as_slice()
);
assert_eq!([TypeId::of::<S1>()], fn_metadata.borrow_muts().as_slice());
struct S0;
struct S1;
struct S2;
Features
"fn_meta_ext"
:
Enables the FnMeta
and FnMetaExt
traits. FnMetaExt
adds the .meta()
function on functions and closures to return a Box<dyn FnMeta>
, which is the dynamic dispatch analog to FnMetadata
.
"high_arg_count"
:
Raises the number of arguments that FnMetaExt
and FnMetadataExt
are implemented for from 6 to 8.
This is feature gated because compilation time increasing significantly with higher numbers of arguments -- as much as from 1.5 seconds for 6 arguments to 8 seconds for 8 arguments.
License
Licensed under either of
- Apache License, Version 2.0, (LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0)
- MIT license (LICENSE-MIT or https://opensource.org/licenses/MIT)
at your option.
Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.