Function diplomat_buffer_write_create 

#[unsafe(no_mangle)]
pub extern "C" fn diplomat_buffer_write_create(
    cap: usize,
) -> *mut DiplomatWrite

Create an DiplomatWrite that can write to a dynamically allocated buffer managed by Rust.

Use diplomat_buffer_write_destroy() to free the writable and its underlying buffer. The pointer is valid until that function is called.

This is largely used internally by Diplomat-generated FFI code, and should not need to be constructed manually outside of that context. See RustWriteVec if you need this in Rust.

The grow impl never sets grow_failed, although it is possible for it to panic.