Alternatives

In addition to directly using the feature, sometimes the following alternative approaches are also helpful.

Proxy

The proxy feature can be utilized when the borrowed type is indeed a field of struct or something like that. Please refer to this page for more details.

Shared ownership

One alternative approach is to use shared ownership. For example, we can write something like:

struct MyStruct {
    field: Arc<Another>,
}

As a side remark, if you want to expose that field to Dart side in opaque struct, you can also wrap as RustAutoOpaque<Another>.

Clone

Yet another way is to simply clone related things when returned, instead of returning a reference. This is especially reasonable when the resource being cloned is not heavy.