Write example for serializing external types using wrapper types

[ezkangaroo]

Hello, I'm trying to use rkvy in a struct which has custom type coming from external library, which provides custom serialize/deserialize, but not sure how to wire them. Here is example Code.

#[derive(Clone, Serialize, Deserialize, PartialEq, Archive)]
pub struct Store {
   pub id: i32,

   pub looker: SomeCustomLooker // coming from external library <- how to use custom functions here??
}

As it happens, external library is providing this functions:

serialize(val: SomeCustomLooker) -> Vec<u8>
deserialize(val: Vec<u8>) -> Result<SomeCustomLooker, ....>

In serde and bincode, I can do

#[derive(Clone, Serialize, Deserialize, PartialEq)]
pub struct Store {
   pub id: i32,

    #[serde(
        serialize_with = "serialize_looker",
        deserialize_with = "deserialize_looker"
    )]
   pub looker: SomeCustomLooker // coming from external library
}

but not sure, how to tackle this with rkvy.

[djkoloski]

rkyv has a related but different system for serializing external types called wrapper types. The book documentation is somewhat sparse, so I encourage you to read the example for ArchiveWith. It's basically a way to let you manually write impls for external types as long as you add an attribute.