On 2015-12-09 08:15, Bubke Marco wrote:
> Should we recommend forward(universal) references in for loops (which are
> "const &value" for "const values"):
>
> for (auto &&value : values)
Someone remind me; what's the benefit of this vs. 'auto const&'
(assuming that I won't be modifying 'value')?
> or
>
> for (const auto &value : values)
>
> to show the difference to
>
> for (auto &value : values)
I personally prefer making everything I can 'const'. That means 'const&'
returns from functions ("forces" a copy elision), 'const' local
variables, etc.. In the case of loops like the above, if I'm not going
to modify the value, I prefer to say so. If I *am* going to modify it, I
prefer 'auto&' to a) also say so, and b) statically ensure that I *can*.
That's just my 2¢ however; I'd be interested in hearing arguments for
'auto&&'.
--
Matthew
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