ceph/src/boost/libs/hana/test/optional/fold_right.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/fold_right.hpp>
   8 #include <boost/hana/optional.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::ct_eq<3> s{};
  17     hana::test::_injection<0> f{};
  18
  19     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  20         hana::fold_right(hana::just(x), s, f),
  21         f(x, s)
  22     ));
  23
  24     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  25         hana::fold_right(hana::nothing, s, f),
  26         s
  27     ));
  28 }