On Fri, Apr 16, 2021 at 10:22 PM Willy Tarreau <w...@1wt.eu> wrote: > > So it simply does the equivalent of: > > struct result { > int status; > int error; > };
Not exactly, it is more like a tagged union, as Connor mentioned. However, and this is the critical bit: it is a compile-time error to access the inactive variants (in safe code). In C, it is on you to keep track which one is the current one. > kill_foo(); // only for rust, C doesn't need it Please note that `kill_foo()` is not needed in Rust -- it was an example of possible cleanup (since Al mentioned resources/cleanup) using RAII. Cheers, Miguel