ceph/src/boost/libs/hana/test/optional/is_nothing.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/not.hpp>
   7 #include <boost/hana/optional.hpp>
   8 namespace hana = boost::hana;
   9
  10
  11 struct undefined { };
  12
  13 int main() {
  14     BOOST_HANA_CONSTANT_CHECK(hana::is_nothing(hana::nothing));
  15     BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::is_nothing(hana::just(undefined{}))));
  16     BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::is_nothing(hana::just(hana::nothing))));
  17 }