1 pub const MAGIC_NUMBER: u64 = 0xABCD_EFAB;

     2 

     3 #[derive(Debug)]

     4 #[repr(C)]

     5 pub struct Point {

     6     x: u64,

     7     y: u64,

     8 }

     9 

    10 impl Point {

    11     pub(crate) fn add(&mut self, rhs: &Point) {

    12         self.x = self.x.wrapping_add(rhs.x);

    13         self.y = self.y.wrapping_add(rhs.y);

    14     }

    15 }

    16 

    17 #[no_mangle]

    18 pub extern "C" fn add_point(lhs: Option<&mut Point>, rhs: Option<&Point>) {

    19     if let (Some(p1), Some(p2)) = (lhs, rhs) {

    20         p1.add(p2);

    21         // Print something so we can let Ctest assert the output.

    22         println!("add_point Result: {:?}", p1);

    23     }

    24 }

    25 

    26 // simple test if the constant was exported by cbindgen correctly

    27 #[no_mangle]

    28 pub extern "C" fn is_magic_number(num: u64) -> bool {

    29     num == MAGIC_NUMBER

    30 }