[cfe-dev] libc++: is_abstract<abstract_class_template<T>>::value is false

[Eric Fiselier via cfe-dev]

Hi Katsuhiko,

This is indeed a libc++ bug. Thank you for reporting it.

I have filed an actual bug report here:
https://bugs.llvm.org/show_bug.cgi?id=32097

/Eric

On Fri, Feb 24, 2017 at 4:29 AM, Katsuhiko Nishimra via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> Dear developers,
>
> I've run into strange behavior around std::is_abstract from libc++.
> It off course returns true for classes with pure virtual functions, but
> returns false for class templates with pure virtual functions. I'm
> attaching a test code for the behavior. I tested on Debian with package
> libc++-dev 3.9.1-2 and both clang-3.8 3.8.1-17 and clang-3.9.1-4.
>
> I have little knowledge about C++ standards, but is this behavior
> compliant with the standards?
>
> FWIW, std::is_abstract from libstdc++ returns true for both cases.
>
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>
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