protobuf/rust/upb_kernel/upb.rs

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// Rust Protobuf runtime using the UPB kernel.

/// Represents UPB's upb_Arena.
#[repr(C)]
pub struct Arena {
    _data: [u8; 0],
    _marker: core::marker::PhantomData<(*mut u8, core::marker::PhantomPinned)>,
}

impl Arena {
    pub unsafe fn new() -> *mut Self {
        upb_Arena_New()
    }

    pub unsafe fn free(arena: *mut Self) {
        upb_Arena_Free(arena)
    }
}

extern "C" {
    pub fn upb_Arena_New() -> *mut Arena;
    pub fn upb_Arena_Free(arena: *mut Arena);
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_arena_new_and_free() {
        let arena = unsafe { Arena::new() };
        unsafe { Arena::free(arena) };
    }
}