Subject: Re: [boost] [optional] Regression in develop
From: Andrzej Krzemienski (akrzemi1_at_[hidden])
Date: 2017-10-30 09:44:33
2017-10-30 10:14 GMT+01:00 Vinnie Falco via Boost <boost_at_[hidden]>:
> On Mon, Oct 30, 2017 at 12:47 AM, Andrzej Krzemienski via Boost
> <boost_at_[hidden]> wrote:
> > The following is a test case in type_traits by Vinnie Falco:
> > https://github.com/boostorg/type_traits/pull/52/commits/
> My idea for a fix is to just specialize
> `type_traits::is_default_constructible` for `std::pair<T,U>` where U
> is a built-in type, by returning `is_default_constructible<T>`. This
> solves the problem for Optional, which invokes
> `is_default_constructible` with `std::pair<T, bool>` in this specific
> Disclosure: Peter Dimov doesn't like it.
I think I agree with Peter here. What if somebody is using boost::pair?
I think I will take time to detect all the broken compilers using test
matrix and disable the feature on those compilers.
Boost list run by bdawes at acm.org, gregod at cs.rpi.edu, cpdaniel at pacbell.net, john at johnmaddock.co.uk