libs/hana/test/ext/std/integral_constant/constant.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/ext/std/integral_constant.hpp>
   6
   7 #include <boost/hana/tuple.hpp>
   8 #include <boost/hana/value.hpp>
   9
  10 #include <laws/constant.hpp>
  11
  12 #include <type_traits>
  13 namespace hana = boost::hana;
  14
  15
  16 int main() {
  17     // value
  18     static_assert(hana::value(std::integral_constant<int, 0>{}) == 0, "");
  19     static_assert(hana::value(std::integral_constant<int, 1>{}) == 1, "");
  20     static_assert(hana::value(std::integral_constant<int, 3>{}) == 3, "");
  21
  22     // laws
  23     hana::test::TestConstant<hana::ext::std::integral_constant_tag<int>>{
  24         hana::make_tuple(
  25             std::integral_constant<int, -10>{},
  26             std::integral_constant<int, -2>{},
  27             std::integral_constant<int, 0>{},
  28             std::integral_constant<int, 1>{},
  29             std::integral_constant<int, 3>{}
  30         ),
  31         hana::tuple_t<int, long, long long>
  32     };
  33 }