ceph/src/boost/libs/hana/test/optional/unpack.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/assert.hpp>
   6 #include <boost/hana/equal.hpp>
   7 #include <boost/hana/optional.hpp>
   8 #include <boost/hana/unpack.hpp>
   9
  10 #include <laws/base.hpp>
  11 namespace hana = boost::hana;
  12
  13
  14 int main() {
  15     hana::test::ct_eq<2> x{};
  16     hana::test::_injection<0> f{};
  17
  18     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  19         hana::unpack(hana::nothing, f),
  20         f()
  21     ));
  22
  23     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  24         hana::unpack(hana::just(x), f),
  25         f(x)
  26     ));
  27
  28     // Previously, there was a bug that would make this fail.
  29     auto non_const_nothing = hana::nothing;
  30     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  31         hana::unpack(non_const_nothing, f),
  32         f()
  33     ));
  34 }