Trait Variable

Make variable fields feasible in trait definition by procedural macros.

This crate provides macros allowing you to easily implement traits with variable fields just like using inheritance within C++/Python... of parent classes. And this crate would not be exited if the fields_in_trait is implemented officially.

Usage

Add trait_variable to your Cargo.toml:

[dependencies]
trait_variable = "*"

Then, use the macros in your Rust code:

use trait_variable::trait_variable;

#[trait_variable(MyTrait)]
struct MyStruct {
    // Your struct fields
}

TODO list

[] expand code fix for public/private trait;
[] try to support self.<trait_field> directly in trait method body(this may be hard or even impossible under current rust macro system v.1.75 2021);
[] try to let smart intellisense extension(like Rust Analyzer) support inside macro.

The trait_variable macro will generate a default implementation of MyTrait for MyStruct, using todo!() for all methods not explicitly implemented.

Requirements

Rust edition 2021 or later. All code is tested under Rust Version 1.74.0.

Contributing

Contributions are welcome! Please feel free to submit a pull request or open an issue on the GitHub repository.

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)