Implementing and optimizing a simple graph metric
Joseph Rushton Wakeling
joseph.wakeling at webdrake.net
Thu Sep 26 14:09:30 PDT 2013
On Thursday, 26 September 2013 at 20:56:39 UTC, bearophile wrote:
> Joseph Rushton Wakeling:
>> I have not found this -- using minimallyInitializedArray for
>> the arrays of built-in types is slower than if I use
> Then minimallyInitializedArray should be improved :-)
It's odd, because the two actually use the same underlying
function, with minimallyInitializedArray potentially triggering
else static if(minimallyInitialized && hasIndirections!E)
ret = E.init;
... but if E is (say) an int, or a size_t, or any other built-in
type, this should not be triggered -- right?
So it's bizarre that there is a performance difference here.
Incidentally, this was why I felt safe using uninitializedArray
for arrays of e.g. long, size_t, etc., because the only
difference at the end of the function could be whether the values
contained in the array have been set or not. As I do ensure that
any array entry used also has its value set, it should be OK.
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