Macro def_object_ref

def_object_ref!() { /* proc-macro */ }

Define the reference to an object type, as C++ TVM_FFI_DEFINE_OBJECT_REF_METHODS_NOTNULLABLE does: def_object_ref!(TypeName, ParentType, ObjectName).

use tvm_ffi::def_object_ref;

def_object_ref!(
    /// A pair of values.
    pub Pair,
    Base,
    PairObj
);

Pair holds a PairObj and is a derive(ObjectRef) type. It dereferences to PairObj, and a PairObj converts into it.

ParentType is the reference to the parent’s object: Base here, and tvm_ffi::object::ObjectRef for a type under ffi.Object. Pair converts into it by impl_object_upcast!, so its object must be a registered base of PairObj, as that macro requires. A conversion into the reference to a further ancestor takes its own impl_object_upcast!.

Attributes and visibility before the name go on the struct. crate = path after the object type is where the generated code finds tvm-ffi, as for [rs_class].