auto_impl

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

Usage

This library requires Rust 1.37.0 or newer.

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

// 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:

// This will generate two additional impl blocks: one for `&T` and one
// for `Box<T>` where `T: Foo`.
#[auto_impl(&, Box)]
trait Foo {
    fn foo(&self);
}

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

fn requires_foo(_: impl Foo) {}


requires_foo(0i32);  // works: through the impl we defined above
requires_foo(&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.