ceph/src/boost/libs/hana/test/optional/transform.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 #include <boost/hana/transform.hpp>
   9
  10 #include <laws/base.hpp>
  11 namespace hana = boost::hana;
  12 using hana::test::ct_eq;
  13
  14
  15 struct undefined { };
  16
  17 int main() {
  18     hana::test::_injection<0> f{};
  19
  20     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  21         hana::transform(hana::nothing, undefined{}),
  22         hana::nothing
  23     ));
  24
  25     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  26         hana::transform(hana::just(ct_eq<3>{}), f),
  27         hana::just(f(ct_eq<3>{}))
  28     ));
  29 }