220 5857 <5EEBFD4F-87A9-4543-8449-B5CAAC2E29E6@gmail.com> article
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From: Howard Hinnant <howard.hinnant@gmail.com>
Newsgroups: gmane.comp.lang.c++.isocpp.proposals
Subject: Re: Remove vector<bool>?
Date: Mon, 26 Aug 2013 20:36:11 -0400
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On Aug 26, 2013, at 8:28 PM, Zhihao Yuan <zy@miator.net> wrote:

> On Mon, Aug 26, 2013 at 8:16 PM, Geoffrey Romer <gromer@google.com> wrote=
:
>> template <typename iter_t>
>> value_type& GetValue(iter_t iter) {
>>  return *iter;
>> }
>=20
> I think this can be "corrected" by just replacing the return type
> with `auto` :(

I was going to suggest:

typename std::iterator_traits<iter_t>::reference

but I like Zhihao's suggestion a lot better.  Unless you need the iterator_=
traits dance for SFINAE purposes.

Bottom line:  All we have to do is stop assuming that *iter returns a value=
_type&.  We already can not assume that for input iterators, do this does n=
ot seem like a big stretch.  And we already can not assume it for output it=
erators, even though we can use output iterators to modify values.

Howard

--=20

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