On 13-08-23 12:16 PM, Simon Sapin wrote: > Le 23/08/2013 19:47, Matthieu Monrocq a écrit : >> The most trivial mistake is to have `+=` and `+` defined so that `a += >> 5` has a different result than `a = a + 5` > > Would it work to make `a += b` always expand to `a = a + b`, and have > that not be overridable? Or am I missing something else?
Generally these operators want to be able to implement optimized versions that do not produce and destroy temporaries. This might be a bit less of an issue when you're working with moved values, but that just (pardon the pun) moves the implementation challenge elsewhere: making sure that plus(&a,&b) as you'd have on non-owned values is the same as plus(a,b) on owned-and-moved values. It's all a bit subtle. -Graydon _______________________________________________ Rust-dev mailing list Rust-dev@mozilla.org https://mail.mozilla.org/listinfo/rust-dev
