ceph/src/boost/libs/hana/test/optional/value_or.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
   9 #include <laws/base.hpp>
  10 namespace hana = boost::hana;
  11 using hana::test::ct_eq;
  12
  13
  14 struct undefined { };
  15
  16 int main() {
  17     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  18         hana::nothing.value_or(ct_eq<3>{}),
  19         ct_eq<3>{}
  20     ));
  21
  22     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  23         hana::just(ct_eq<4>{}).value_or(undefined{}),
  24         ct_eq<4>{}
  25     ));
  26 }