Re: [boost] [range] Best way to count the elements in a filtered range?

Subject: Re: [boost] [range] Best way to count the elements in a filtered range?
From: Gonzalo Brito Gadeschi (g.brito_at_[hidden])
Date: 2013-06-19 07:26:26

Sorry, the email was send twice. Please refer to the _other_ thread.

P.S: can someone delete this thread?

On Wed, Jun 19, 2013 at 1:06 PM, Darren Garvey <darren.garvey_at_[hidden]>wrote:

> On 19 June 2013 11:41, Gonzalo BG <gonzalobg88_at_[hidden]> wrote:
>
> > I wonder what is the recommended way to count the elements in a filtered
> > range.
> >
> > Let range be a random access range, and filter the result of
> > filtered(predicate),
> >
> > auto filtered_range = range | filter;
> > count_if( filtered_range, [](const&){ return true; }); // (& omitted in
> > lambda)
> >
>
> I think boost::size() is what you want.
>
> size_t s = boost::size(range | filter);
>
> See: http://www.boost.org/doc/libs/1_53_0/boost/range/size.hpp
>
> --
> Darren
>
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