multi-trait-object/README.md

Multitrait Object

This crate provides a pointer type that allows casting into all registered traits for a given type. This is done by storing the pointer to the v-table for each trait implementation on the type as well as the pointer to the data.

Usage

use multi_trait_object::prelude::*;
use std::fmt::Debug;

#[derive(Debug)]
struct MyStruct {
     a: u64,
}

trait MyTrait {}
trait MyOtherTrait {}

impl MyTrait for MyStruct{}
impl MyOtherTrait for MyStruct {}

impl_trait_object!(MyStruct, dyn MyTrait, dyn MyOtherTrait, dyn Debug);

fn main() {
    let obj = MyStruct {
        a: 5
    };

    let mto = obj.into_multitrait();

    {
        let debug = mto.downcast_trait::<dyn Debug>().unwrap();
        println!("{:?}", debug);
        let my_trait = mto.downcast_trait::<dyn MyTrait>().unwrap();
    }
    
    let trait_box: Box<dyn MyTrait> = mto.downcast_trait_boxed::<dyn MyTrait>().unwrap();    
}

License

Apache-2.0