Development has moved to https://github.com/rust-lang/impl-trait-utils.

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impl_trait_utils

Utilities for working with impl traits in Rust.

trait_transformer

Trait transformer is an experimental crate that generates specialized versions of a base trait. For example, if you want a Sendable version of your trait, you'd write:

#[trait_transformer(SendIntFactory: Send)]
trait IntFactory {
    async fn make(&self) -> i32;
    // ..or..
    fn stream(&self) -> impl Iterator<Item = i32>;
    fn call(&self) -> u32;
}

Which creates a new SendIntFactory: IntFactory + Send trait and additionally bounds SendIntFactory::make(): Send and SendIntFactory::stream(): Send. The generated sytax is still experimental, as it relies on the nightly and unstable async_fn_in_trait, return_position_impl_trait_in_trait, and return_type_notation features.

License and usage notes

Licensed under either of Apache License, Version 2.0 or MIT license at your option.

This is not an officially supported Google product.