On Sunday, 22 February 2015 at 02:35:02 UTC, Adam D. Ruppe wrote:
On Sunday, 22 February 2015 at 02:27:30 UTC, Peter Alexander
wrote:
Seems questionable to me. Anyone know the rationale?
I actually agree it is a bit questionable, but I think the
difference is += is, conceptually at least, atomic - it is a
single function, append() instead of two calls,
set(calculate()).
I can see where you are coming from, but the fact of the matter
is that it is evaluated no differently than a = a + b. Why, in
the a += b case, does it somehow become acceptable for the
compiler to irresponsibly insert in an implicit narrowing
conversion?
