[boost] Re: Re: Re: Re: Re: Adding Loki to Boost (reprise)

From: Aleksey Gurtovoy (agurtovoy_at_[hidden])
Date: 2002-04-14 15:47:35

David Abrahams wrote:
> And, BTW, isn't there a meta-lambda version of the above which simplifies
> things a bit?

There is indeed:

    template<
          typename Sequence
        , typename Predicate
        >
    struct count_if
    {
        typedef typename fold<
              Sequence
            , integral_c<unsigned long, 0>
            , select_if< apply<Predicate,_2>, next<_1>, _1 >
            >::type type;
    };

Aleksey