ceph/src/boost/libs/hana/test/optional/flatten.cpp

   1 // Copyright Louis Dionne 2013-2016
   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/flatten.hpp>
   8 #include <boost/hana/optional.hpp>
   9
  10 #include <laws/base.hpp>
  11 namespace hana = boost::hana;
  12 using hana::test::ct_eq;
  13
  14
  15 int main() {
  16     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  17         hana::flatten(hana::nothing),
  18         hana::nothing
  19     ));
  20     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  21         hana::flatten(hana::just(hana::nothing)),
  22         hana::nothing
  23     ));
  24     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  25         hana::flatten(hana::just(hana::just(ct_eq<4>{}))),
  26         hana::just(ct_eq<4>{})
  27     ));
  28 }