Macro ffi_support::implement_into_ffi_by_pointer

macro_rules! implement_into_ffi_by_pointer {
    ($($T:ty),* $(,)*) => { ... };
}

Implements [IntoFfi] for the provided types (more than one may be passed in) by allocating $T on the heap as an opaque pointer.

This is typically going to be used from the “Rust component”, and not the “FFI component” (see the top level crate documentation for more information), however you will still need to implement a destructor in the FFI component using define_box_destructor!.