how to add dynamic context to functions?

[nrbnlulu]

I have a usecase where I need to add a context to a function like so

fn foo() {
    let env = create_env();
    let zoos = vec![Zoo::new(), Zoo::new()];

    for zoo in zoos {
        let zoo_clone = zoo.clone();
        env.add_function("get_animal_cage_number", |animal_name: &str| {
            get_animal_cage_number(zoo.get_animal(animal_name))
        });
        env.render_template(zoo);
    }
}

as you can see the template is Zoo contexed so I need some functions to be injected with a Zoo instance.

What I thought I can do is to create an Env for each Zoo, would that be good? wouldn't it cause unnecessary template compiles?

[mitsuhiko]

I would probably pass Zoo in as a global (maybe with a hidden name like $zoo) and then resolve and downcast it.