Derive Macro ProstValue 

#[derive(ProstValue)]
{
    // Attributes available to this derive:
    #[cel_cxx]
}

Available on crate feature derive only.

Derive macro for prost-generated protobuf types.

Generates TypedValue, IntoValue, FromValue, From<T> for Value, and TryFrom<Value> implementations using prost serialization.

Requirements

The type must implement prost::Message and prost::Name. Enable prost::Name generation via .enable_type_names() in prost-build.

Attributes

• type_name = "...": Override the protobuf type name (default: prost::Name::full_name()).
• crate = ...: Custom path to the cel_cxx crate.

Setup

In your build.rs, inject the derive via type_attribute():

// build.rs
prost_build::Config::new()
    .enable_type_names()
    .type_attribute("my.package.MyMessage", "#[derive(::cel_cxx::ProstValue)]")
    .compile_protos(&["proto/my.proto"], &["proto/"])
    .unwrap();