rust/src/test/run-pass/extern-pass-TwoU32s.rs

// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

// Test a foreign function that accepts and returns a struct
// by value.

#[derive(Copy, PartialEq, Debug)]
pub struct TwoU32s {
    one: u32, two: u32
}

#[link(name = "rust_test_helpers")]
extern {
    pub fn rust_dbg_extern_identity_TwoU32s(v: TwoU32s) -> TwoU32s;
}

pub fn main() {
    unsafe {
        let x = TwoU32s {one: 22, two: 23};
        let y = rust_dbg_extern_identity_TwoU32s(x);
        assert_eq!(x, y);
    }
}