ceph/src/boost/libs/hana/test/optional/concat.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/concat.hpp>
   7 #include <boost/hana/equal.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     auto rv_nothing = [] { return hana::nothing; }; // rvalue nothing
  17
  18     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  19         hana::concat(rv_nothing(), hana::nothing),
  20         hana::nothing
  21     ));
  22     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  23         hana::concat(hana::nothing, rv_nothing()),
  24         hana::nothing
  25     ));
  26     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  27         hana::concat(rv_nothing(), rv_nothing()),
  28         hana::nothing
  29     ));
  30     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  31         hana::concat(rv_nothing(), hana::just(ct_eq<0>{})),
  32         hana::just(ct_eq<0>{})
  33     ));
  34     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  35         hana::concat(hana::just(ct_eq<0>{}), rv_nothing()),
  36         hana::just(ct_eq<0>{})
  37     ));
  38
  39     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  40         hana::concat(hana::nothing, hana::nothing),
  41         hana::nothing
  42     ));
  43     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  44         hana::concat(hana::nothing, hana::just(ct_eq<0>{})),
  45         hana::just(ct_eq<0>{})
  46     ));
  47     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  48         hana::concat(hana::just(ct_eq<0>{}), hana::nothing),
  49         hana::just(ct_eq<0>{})
  50     ));
  51     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  52         hana::concat(hana::just(ct_eq<0>{}), hana::just(ct_eq<1>{})),
  53         hana::just(ct_eq<0>{})
  54     ));
  55 }