Shared via Rust Playground

playground.rs

#![feature(box_syntax, box_patterns)]
#![allow(dead_code, unused_variables)]

pub trait TraitObject {
    fn safe_method(&mut self);
}

pub struct Description {
    common_field: &'static str,
}

pub trait Builder {
    fn describe(&self) -> &'static Description;
    fn probe(&self, &str) -> bool;
    fn alloc(&self) -> Box<TraitObject>;
}

struct Obj1 {
    internal_field: usize,
}

impl TraitObject for Obj1 {
    fn safe_method(&mut self) {
        println!("Method called {}", self.internal_field);
    }
}

static OBJ_DESCR: Description = Description { common_field: "Obj1" };

struct Build1 {
}

impl Builder for Build1 {
    fn describe(&self) -> &'static Description {
        &OBJ_DESCR
    }
    fn probe(&self, data: &str) -> bool {
        true
    }
    fn alloc(&self) -> Box<TraitObject> {
        let obj = Obj1 { internal_field: 0 };
        box obj
    }
}

const BUILD1: Build1 = Build1 {};

const BUILDERS: [&'static Builder; 1] = [&BUILD1];

fn main() {


    println!("Probe {}", BUILDERS[0].probe("foo"));
    
    
}