On Sunday, 22 February 2015 at 02:52:47 UTC, Peter Alexander
wrote:
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?
It is only equivalent for integral greater than int. It is not
for smaller integrals or floating point. See my other answer for
rationale.
