auto_impl

A proc-macro attribute for automatically implementing a trait for references, some common smart pointers and closures.

Usage

This library requires Rust 1.30.0 or newer.

Add auto_impl to your Cargo.toml and just use it in your crate:

rust // In Rust 2015 you still need `extern crate auto_impl;` at your crate root use auto_impl::auto_impl;

Add an auto_impl attribute to traits you want to automatically implement for wrapper types. Here is a small example:

``rust // This will generate two additional impl blocks: one for&Tand one // forBoxwhereT: Foo`.

[auto_impl(&, Box)]

trait Foo { fn foo(&self); }

impl Foo for i32 { fn foo(&self) {} }

fn requiresfoo(: impl Foo) {}

requiresfoo(0i32); // works: through the impl we defined above requiresfoo(&0i32); // works: through the generated impl requires_foo(Box::new(0i32)); // works: through the generated impl ```

For more explanations, please see the documentation and for more examples, see the examples folder.

License

Licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://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.