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Subject: Re: [boost] About all these metaprogramming libraries
From: Niall Douglas (s_sourceforge_at_[hidden])
Date: 2017-03-20 08:58:49

> Let me put this another way: do any of the other metaprogramming
> libraries add *in pure API or capability terms* anything over Hana?
> I don't mean to derail the discussion again, but since you asked, Metal
> provides SFINAE-friendliness guarantees that Hana does not. Think
> std::enable_if on steroids.

Thanks for the info.

However to continue to play devil's advocate, is that a highly
motivating reason for an additional metaprogramming library over Hana in
Boost when Concepts will ship in every major compiler this year or next?

If someone were proposing a metaprogramming library which allowed me to
write code which uses Concepts on a supporting compiler, but fell back
to a C++ 14 emulation on older compilers, that I'd find that a
compelling reason for an additional Boost metaprogramming library.


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