alef 0.20.0

Opinionated polyglot binding generator for Rust libraries
Documentation 
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#[extendr]
pub fn {{ register_fn }}(r_backend: extendr_api::Robj) -> std::result::Result<(), String> {
{% if required_methods %}
    let required_methods = [{{ required_methods_list }}];
    for method in &required_methods {
        match r_backend.dollar(method) {
            Ok(v) if !v.is_null() && !v.is_na() => {},
            _ => return Err(format!("Backend missing required method: {}", method)),
        }
    }

{% endif %}
    let wrapper = {{ wrapper }}::new(r_backend)?;
    let arc: Arc<dyn {{ trait_path }}> = Arc::new(wrapper);

    let registry = {{ registry_getter }}();
    let mut registry = registry.write();
    registry.register(arc).map_err(|e| {
        format!("Failed to register backend: {}", e)
    })
}