15.2 Reflection

comptime fn toCsvRow<T>(x: &T) -> String {
  var out = String.new()
  inline for f in reflect(T).fields where f.visible {
    out.push("{x.[f]},")
  }
  out
}

• reflect(T) -> TypeInfo (comptime only): name, kind (Data, Enum, Union, Prim, Interface, Service, Actor, Topic, Config), fields (name, type, tag, attrs, visibility, default), variants, methods (name, params, ret, effects, attrs), rpcs, attributes.
• x.[f] — access to a field by the comptime value FieldInfo.
• Runtime reflection only for types with @reflect: rt.typeinfo(x), rt.get(x, "field") -> Any | NoField, rt.set(&var x, "field", v), rt.call(&x, "method", args) -> Any | CallError. Types without @reflect have no metadata in the binary.
• Reflection sees only what is visible at the point of the call under the rules of §2.3.

Source: docs/spec/oxl-standard.en.md