Mention "extern types" on the opaque structs section

pull/273/head
Yuki Okushi 3 years ago
parent 55de6fa3c1
commit 9387d35984

@ -705,8 +705,14 @@ for more information.
# Representing opaque structs
Sometimes, a C library wants to provide a pointer to something, but not let you
know the internal details of the thing it wants. The simplest way is to use a
`void *` argument:
know the internal details of the thing it wants. The simplest way is to use "extern types".
But it's currently (as of June 2021) unstable and has some unresolved questions,
see the [RFC page][extern-type-rfc] and the [tracking issue][extern-type-issue] for more details.
[extern-type-issue]: https://github.com/rust-lang/rust/issues/43467
[extern-type-rfc]: https://rust-lang.github.io/rfcs/1861-extern-types.html
Alternatively, we can use a `void *` argument:
```c
void foo(void *arg);

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