ceph/src/boost/libs/hana/example/set/searchable.cpp

   1 // Copyright Louis Dionne 2013-2016
   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/at_key.hpp>
   7 #include <boost/hana/equal.hpp>
   8 #include <boost/hana/find.hpp>
   9 #include <boost/hana/integral_constant.hpp>
  10 #include <boost/hana/optional.hpp>
  11 #include <boost/hana/set.hpp>
  12 namespace hana = boost::hana;
  13
  14
  15 int main() {
  16     constexpr auto xs = hana::make_set(hana::int_c<0>, hana::int_c<1>, hana::int_c<2>);
  17     BOOST_HANA_CONSTANT_CHECK(hana::find(xs, hana::int_c<0>) == hana::just(hana::int_c<0>));
  18     BOOST_HANA_CONSTANT_CHECK(hana::find(xs, hana::int_c<3>) == hana::nothing);
  19
  20     // operator[] is equivalent to at_key
  21     BOOST_HANA_CONSTANT_CHECK(xs[hana::int_c<2>] == hana::int_c<2>);
  22
  23     // long_c<0> == int_<0>, and therefore int_<0> is found
  24     BOOST_HANA_CONSTANT_CHECK(xs[hana::long_c<0>] == hana::int_c<0>);
  25 }