ceph/src/boost/libs/hana/test/concept/constant/mcd.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 "minimal.hpp"
   6
   7 #include <boost/hana/concept/constant.hpp>
   8 #include <boost/hana/value.hpp>
   9 namespace hana = boost::hana;
  10
  11
  12 // Make sure we really satisfy Constant.
  13 static_assert(hana::Constant<minimal_constant<int, 0>>::value, "");
  14 static_assert(hana::Constant<minimal_constant<int, 1>>::value, "");
  15 static_assert(hana::Constant<minimal_constant<int, 2>>::value, "");
  16 static_assert(hana::Constant<minimal_constant<int, 3>>::value, "");
  17
  18 // Make sure we can use hana::value<> properly.
  19 static_assert(hana::value<minimal_constant<int, 0>>() == 0, "");
  20 static_assert(hana::value<minimal_constant<int, 1>>() == 1, "");
  21 static_assert(hana::value<minimal_constant<int, 2>>() == 2, "");
  22 static_assert(hana::value<minimal_constant<int, 3>>() == 3, "");
  23
  24 // Check the equivalence between `value(...)` and `value<decltype(...)>()`.
  25 static_assert(hana::value(minimal_constant<int, 0>{}) == hana::value<minimal_constant<int, 0>>(), "");
  26 static_assert(hana::value(minimal_constant<int, 1>{}) == hana::value<minimal_constant<int, 1>>(), "");
  27 static_assert(hana::value(minimal_constant<int, 2>{}) == hana::value<minimal_constant<int, 2>>(), "");
  28 static_assert(hana::value(minimal_constant<int, 3>{}) == hana::value<minimal_constant<int, 3>>(), "");
  29
  30
  31 int main() { }