Struct RustealRustCallbacks 

#[repr(C)]
pub struct RustealRustCallbacks {
    pub drop_rust_instance: extern "C" fn(handle: UObjectHandle, type_id: u64, rust_data: *mut u8),
    pub invoke_rust_function: extern "C" fn(callback_id: u64, obj: UObjectHandle, params: *mut u8),
    pub invoke_delegate_callback: extern "C" fn(callback_id: u64, params: *mut u8),
    pub on_shutdown: extern "C" fn(),
    pub construct_rust_instance: extern "C" fn(obj: UObjectHandle, type_id: u64, is_cdo: bool),
    pub notify_pinned_destroyed: extern "C" fn(handle: UObjectHandle),
    pub on_tick: extern "C" fn(delta_seconds: f32),
}

Callback table filled by Rust and returned to C++ from rusteal_init. C++ calls into Rust through these function pointers.

Fields

drop_rust_instance: extern "C" fn(handle: UObjectHandle, type_id: u64, rust_data: *mut u8)

Called when a Rust-defined UClass instance is destroyed (reify only).

invoke_rust_function: extern "C" fn(callback_id: u64, obj: UObjectHandle, params: *mut u8)

UE → Rust function call forwarding (for Rust-defined UFunctions).

invoke_delegate_callback: extern "C" fn(callback_id: u64, params: *mut u8)

Delegate callback forwarding.

on_shutdown: extern "C" fn()

Shutdown notification — Rust should release all resources.

construct_rust_instance: extern "C" fn(obj: UObjectHandle, type_id: u64, is_cdo: bool)

Called by C++ when a reified class instance is constructed.

notify_pinned_destroyed: extern "C" fn(handle: UObjectHandle)

Called by C++ when a Pinned object is destroyed (DestroyActor, level unload, etc.).

on_tick: extern "C" fn(delta_seconds: f32)

Called by C++ every frame on the game thread (the core ticker: in the editor and in games, with or without a world).