mirror of
https://github.com/rust-lang/rust
synced 2024-11-05 20:45:15 +00:00
31 lines
693 B
Rust
31 lines
693 B
Rust
//@ run-pass
|
|
#![allow(dead_code)]
|
|
#![allow(non_upper_case_globals)]
|
|
|
|
struct CustomAutoRooterVFTable {
|
|
trace: unsafe extern "C" fn(this: *mut i32, trc: *mut u32),
|
|
}
|
|
|
|
unsafe trait CustomAutoTraceable: Sized {
|
|
const vftable: CustomAutoRooterVFTable = CustomAutoRooterVFTable {
|
|
trace: Self::trace,
|
|
};
|
|
|
|
unsafe extern "C" fn trace(this: *mut i32, trc: *mut u32) {
|
|
let this = this as *const Self;
|
|
let this = this.as_ref().unwrap();
|
|
Self::do_trace(this, trc);
|
|
}
|
|
|
|
fn do_trace(&self, trc: *mut u32);
|
|
}
|
|
|
|
unsafe impl CustomAutoTraceable for () {
|
|
fn do_trace(&self, _: *mut u32) {
|
|
// nop
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
let _ = <()>::vftable;
|
|
}
|