Boost C++ Libraries: Ticket #12092: Request: allow std::tuple typelists in BOOST_AUTO_TEST_CASE_TEMPLATE()

anonymous — Tue, 24 Oct 2017 04:56:25 GMT

As a heavy user of BOOST unit test I would love to see this idea implemented.

owner, status, milestone changed

Raffi Enficiaud — Wed, 03 Jan 2018 00:20:36 GMT

owner changed from Gennadiy Rozental to Raffi Enficiaud
status new → assigned
milestone To Be Determined → Boost 1.66.0

Raffi Enficiaud — Wed, 03 Jan 2018 00:47:50 GMT

On branch topic/12092-template-test-case-w-tuples

milestone changed

Raffi Enficiaud — Thu, 18 Jan 2018 13:50:37 GMT

milestone Boost 1.66.0 → Boost 1.67.0

Raffi Enficiaud — Fri, 19 Jan 2018 13:39:34 GMT

On develop

status changed; resolution set

Raffi Enficiaud — Mon, 22 Jan 2018 12:55:12 GMT

status assigned → closed
resolution → fixed

On master

Tue, 23 Jan 2018 14:23:00 GMT

Thanks very much for this.

As I now understand it, the TMP gurus avoid using std::tuple as a typelist because it has complex guts that needlessly eat up compiler-time for each instantiation. Instead, I think they typically just use an arbitrary empty template struct, eg:

template <typename...> struct my_typelist_wrapper {};
using a_typelist = my_typelist_wrapper<int, char>;

With this in mind, it might be nice to consider finessing the conversion to mpl::vector so that it works from any arbitrary such typelist (including std::tuple) :

template <template <typename...> class U,
          typename... Ts>
boost::mpl::vector<Ts...> mpl_vector_of_typelist_impl_fn(const U<Ts...> &);
template <typename T>
using mpl_vector_of_typelist_t = decltype( mpl_vector_of_typelist_impl_fn( std::declval<T>() ) );

I'm sorry that I didn't suggest this earlier.

Raffi Enficiaud — Wed, 24 Jan 2018 09:07:17 GMT

That is nice! However I closed this ticket, would you please just create a new one?

Wed, 24 Jan 2018 12:29:24 GMT

Thanks. I've created ticket:13418 for this.