denoland-deno/test_ffi/src/lib.rs

#[no_mangle]
pub extern "C" fn print_something() {
  println!("something");
}

#[no_mangle]
pub extern "C" fn add_u32(a: u32, b: u32) -> u32 {
  a + b
}

#[no_mangle]
pub extern "C" fn add_i32(a: i32, b: i32) -> i32 {
  a + b
}

#[no_mangle]
pub extern "C" fn add_u64(a: u64, b: u64) -> u64 {
  a + b
}

#[no_mangle]
pub extern "C" fn add_i64(a: i64, b: i64) -> i64 {
  a + b
}

#[no_mangle]
pub extern "C" fn add_usize(a: usize, b: usize) -> usize {
  a + b
}

#[no_mangle]
pub extern "C" fn add_isize(a: isize, b: isize) -> isize {
  a + b
}

#[no_mangle]
pub extern "C" fn add_f32(a: f32, b: f32) -> f32 {
  a + b
}

#[no_mangle]
pub extern "C" fn add_f64(a: f64, b: f64) -> f64 {
  a + b
}