Re: [boost] [optional] Regression in develop

2017-10-30 10:14 GMT+01:00 Vinnie Falco via Boost :

On Mon, Oct 30, 2017 at 12:47 AM, Andrzej Krzemienski via Boost wrote:

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The following is a test case in type_traits by Vinnie Falco: https://github.com/boostorg/type_traits/pull/52/commits/ 9779157a787620d163308afa45cb94ef42391b32

My idea for a fix is to just specialize `type_traits::is_default_constructible` for `std::pair` 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` in this specific case.

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. Regards, &rzej;