#traits #alias #create #proc-macro-attributes #generic #internal #external

nightly macro generic_trait_alias

A proc-macro attribute which can be used to create custom type aliases for abstraction

3 releases

0.1.2 Jul 26, 2023
0.1.1 Jul 26, 2023
0.1.0 Jul 26, 2023

#1545 in Procedural macros

MIT license

10KB
205 lines

generic_trait_alias

Holds a proc_macro_attribute which can be used to create type aliases with a more inutive syntax (similar to the way struct aliases are handled)

Install

cargo install generic_trait_alias

or

cargo add generic_trait_alias

Examples

use generic_trait_alias::trait_alias;

// Define internal trait
pub trait Z {
    fn z(&self) -> u8;
}

// Creates a pub trait alias with internal and external traits
#[trait_alias]
pub type X = Z + Clone;

// Creates a private trait alias with internal and external traits
#[trait_alias]
type A = Z + Clone;

// Only works with public alias x
pub fn example_pub<T: X>(x: T) {
    println!("{}", x.z());
}

// Private functions can work with public or private alias
fn example<T: A>(x: A) {
    println!("{}", x.z());
}

Limitations

Currently does not support combined generic traits

No runtime deps