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Subject: Re: [boost] traits classes vs. metafunctions
From: Stefan Strasser (strasser_at_[hidden])
Date: 2013-03-31 13:31:49

Am 31.03.2013 16:36, schrieb Dave Abrahams:
> on Sat Mar 30 2013, Nathan Ridge <> wrote:
>>>> why did c++11 choose traits classes over metafunctions, even though
>>>> the concept of a metafunction was introduced in c++11 (<type_traits>).
>>> ...
>>> P.S. Have you seen what they did with enable_if?
>> Do you mean that the standard version takes the condition as a boolean
>> parameter rather than a type parameter? If so, that actually seems
>> more natural to me.
> More natural in some subjective sense but but less interoperable. Oh well.

I don't understand why they didn't get rid of the "metafunction" concept
as we use it today entirely, but introduce it into the official standard
via type traits.
E.g. via a "constexpr" that can return types, or some other native
syntax for metafunctions.

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