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Add Box<T> to the supported types, where T: Sized #474
Description
As of Rust 1.41.0:
Box<T>, whereT: Sizedis now ABI compatible with the C language's pointer (T*)
types. So if you have anextern "C"Rust function, called from C, your Rust function can
now useBox<T>, for some specificT, while usingT*in C for the corresponding function.
(from Announcing Rust 1.41.0)
So that
#[no_mangle]
pub extern fn test() -> Box<i32> { Box::new(1i32) }
should generate
int32_t * test();
Activity
emilio commentedon Feb 21, 2020
This makes sense. To be clear, you can already do this in C++ if you do:
For C, and maybe for function arguments, we probably want to do this automagically.
The reason why I think we shouldn't do it automatically for C++ members and such is that in C++ having
Box<T>is actually useful (if you don't care aboutBoxparameter-passing).See also the discussion in #451
mgeier commentedon Mar 27, 2020
Are there any news on this?
It would be great to have this!
emilio commentedon Oct 7, 2020
4ce324c fixed this.
mgeier commentedon Oct 7, 2020
Thanks @emilio, this works great!