Re: [boost] About all these metaprogramming libraries

Subject: Re: [boost] About all these metaprogramming libraries
From: Peter Dimov (lists_at_[hidden])
Date: 2017-03-19 20:29:00

Bruno Dutra wrote:
> > It would be possible in principle to make the algorithms take 
> > mpl::vector and return mp_list, I suppose.
>
> You forgot to take into account that algorithms such as mpl::insert and 
> mpl::erase return proxies that inherit from vectors and don't expose the 
> elements in their types signatures, while being themselves valid instances 
> of a Vector. This is the real deal breaker.

On MSVC, insert/erase return numbered vectors, but on g++ and clang++, 
you're right, they return some weird v_item sequences.

What is our use case here though? From where would those mpl types come?