1#[cfg(test)]
2#[path = "./tests.rs"]
3mod tests;
4
5pub(crate) macro weak {
6 (fn $name:ident($($param:ident : $t:ty),* $(,)?) -> $ret:ty;) => (
7 let ref $name: ExternWeak<unsafe extern "C" fn($($t),*) -> $ret> = {
8 unsafe extern "C" {
9 #[linkage = "extern_weak"]
10 static $name: Option<unsafe extern "C" fn($($t),*) -> $ret>;
11 }
12 #[allow(unused_unsafe)]
13 ExternWeak::new(unsafe { $name })
14 };
15 )
16}
17
18pub(crate) struct ExternWeak<F: Copy> {
19 weak_ptr: Option<F>,
20}
21
22impl<F: Copy> ExternWeak<F> {
23 #[inline]
24 pub fn new(weak_ptr: Option<F>) -> Self {
25 ExternWeak { weak_ptr }
26 }
27
28 #[inline]
29 pub fn get(&self) -> Option<F> {
30 self.weak_ptr
31 }
32}
33