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

Try boost::distance(rng | filtered(pred)).

Distance works as expected, thanks! On Wed, Jun 19, 2013 at 5:03 PM, Nathan Crookston < nathan.crookston@gmail.com> wrote:

Hi Gonzalo,

Gonzalo Brito Gadeschi wrote:

...

Someone suggested to use boost::size in the other thread, but size does

boost::end(rng) - boost::begin(rng)

which is not the number of elements in the filtered range.

Try boost::distance(rng | filtered(pred)). Size shouldn't even compile, since it requires random access, and a filtered range cannot be random access.

HTH, Nate

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