Comments (2)
Indeed! FWIW, there is already support for higher-ranked function pointers (stateless), which can test with the ditto
internal branch:
#[derive_ReprC] // Both these attrs will likely become `#[safer_ffi::repr(transparent)]`
#[repr(transparent)]
struct MyLoggerFnPointer(
extern "C" fn(&log::Record<'_>),
);
One API for higher-ranked closures, right now, would be an API very similar to https://docs.rs/stackbox/0.1.2/stackbox/macro.custom_dyn.html (or at least that would be the general solution to #47):
#[safer_ffi::repr(C)] // Defines `BoxDynMyLogger<'_>`, `ArcDynMyLogger<'_>` types.
trait MyLogger : Send + Sync {
fn call (self: &'_ Self, _: &log::Record<'_>);
}
- Btw @Michael-F-Bryan, thanks to your blogpost, there may even be a
#[safer_ffi::repr(C, thin)]
option 🙃
If you have suggestions ideas for these things, I'm all ears 🙂
For the specific case of closures, I could also imagine using the same #[repr(transparent)]
syntax showcased above, but directly supporting the repr_c::closure::…
types:
#[derive_ReprC]
#[repr(transparent)]
struct MyLoggerClosure (
repr_c::BoxDynClosure<fn(&log::Record<'_>)>, // <- optional future syntax for the closure types
);
from safer_ffi.
I know this is an old issue, but I wanted to gauge the situation at the moment, @Michael-F-Bryan:
safer-ffi
nowadays supports FFI-safedyn
traits which can beBox
ed, and which hopefully do support this generic lifetime param in input;- thanks to https://docs.rs/higher-kinded-types, it would be possible to express some
ForFn<ForLt!(&log::Record<'_>)>
kind of type, at least in the covariant case- (or
ForFn<For!(<'a, 'b> = &'a log::Record<'b>)>
in the invariant case)
- (or
from safer_ffi.
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