Re: [boost] [mpl] multiset

Subject: Re: [boost] [mpl] multiset
From: pfultz2 (pfultz2_at_[hidden])
Date: 2015-03-12 16:47:27

> I never need to use helper metafunctions. Meta's expression evaluator
> handles laziness. 

Yes you do use helper metafunctions. Look at your implementation of fold.
With
a library built with full laziness, you should be able to build a SFINAE-
friendly fold like this:

template<class Iterable, class State, class Fun>
using fold = eval_if<empty&lt;Iterable>, 
    State,
    fold<pop_front&lt;Iterable>, lazy_apply<Fun, State, front&lt;Iterable>>,
Fun>
>; 

Is something like this possible with Meta library?

Paul

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