🧬 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
= "0.7.3"
# or
= { = "0.7.3", = ["fn_meta_ext"] }
Code:
use TypeId;
use ;
let fn_metadata = f1.metadata;
assert_eq!;
assert_eq!;
;
;
;
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.