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

From: David Abrahams (david.abrahams_at_[hidden])
Date: 2002-04-11 23:25:11

----- Original Message -----
From: "joel de guzman" <djowel_at_[hidden]>
>
> Simply that I cannot write the simplest MPL algorithm, predicate or
> function without using MPL facilities. Consider this:
>
>     template <class IteratorT, class FunctionT>
>     FunctionT for_each(IteratorT first, IteratorT last, FunctionT
func) {
>       for ( ; first != last; ++first)
>         func(*first);
>       return func;
>     }
>
> This is a full fledged STL functor based *solely* on STL concepts.
> Now rewrite that in MPL using *solely* abstract MPL concepts without
> including anything. You can't because MPL algorithms rely a lot on
> MPL infrastructure.

Just to offer a little more perspective: the STL has some infrastructure
of its own. For example, there is std::iterator_traits<>, which is
needed for writing some algorithms. Granted, the MPL infrastructure
shows up more often because there are no simple

-Dave