ceph/src/boost/libs/hana/test/detail/create.cpp

   1 // Copyright Louis Dionne 2013-2017
   2 // Distributed under the Boost Software License, Version 1.0.
   3 // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
   4
   5 #include <boost/hana/config.hpp>
   6 #include <boost/hana/detail/create.hpp>
   7
   8 #include <utility>
   9 #include <tuple>
  10 namespace hana = boost::hana;
  11
  12
  13 constexpr hana::detail::create<std::tuple> make_tuple{};
  14 constexpr hana::detail::create<std::pair> make_pair{};
  15
  16 template <typename ...>
  17 struct empty { };
  18
  19 template <typename T>
  20 struct single_holder { T x; };
  21
  22 template <typename T>
  23 struct identity { using type = T; };
  24
  25 template <typename ...T>
  26 using identity_t = typename identity<T...>::type;
  27
  28 int main() {
  29     static_assert(make_tuple(1, '2', 3.3) == std::make_tuple(1, '2', 3.3), "");
  30     static_assert(make_pair(1, '2') == std::make_pair(1, '2'), "");
  31
  32     // should work
  33     hana::detail::create<empty>{}();
  34     hana::detail::create<single_holder>{}(1);
  35     hana::detail::create<single_holder>{}([]{});
  36     hana::detail::create<identity_t>{}(1);
  37
  38     // Clang < 3.7.0 fails this test
  39 #if !defined(BOOST_HANA_CONFIG_CLANG) || \
  40     BOOST_HANA_CONFIG_CLANG >= BOOST_HANA_CONFIG_VERSION(3, 7, 0)
  41     hana::detail::create<identity_t>{}([]{});
  42 #endif
  43 }