Re: [boost] Constant iterator of Single Pass Range

Subject: Re: [boost] Constant iterator of Single Pass Range
From: Eric Niebler (eniebler_at_[hidden])
Date: 2014-05-06 21:56:53

On 5/6/2014 1:33 PM, Neil Groves wrote:
> I have done extensive performance measurements upon various arrangements of
> having data in iterators versus ranges. I have been surprised how many
> times a bloated iterator outperforms the indirection to a separate range
> object.

In my (admittedly limited) testing, I agree. In some places in my code,
I've re-bloated iterators I had previously un-bloated simply for
performance reasons. But I've also noticed that at least in some
situations, the optimizer can see through the pointer-to-range stored in
the iterator. That happens when the use of the iterator is not far from
where the iterator was created.

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