ceph/src/boost/libs/hana/example/optional/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/all_of.hpp>
   6 #include <boost/hana/assert.hpp>
   7 #include <boost/hana/equal.hpp>
   8 #include <boost/hana/find_if.hpp>
   9 #include <boost/hana/integral_constant.hpp>
  10 #include <boost/hana/mod.hpp>
  11 #include <boost/hana/not_equal.hpp>
  12 #include <boost/hana/optional.hpp>
  13 namespace hana = boost::hana;
  14
  15
  16 auto odd = [](auto x) {
  17     return x % hana::int_c<2> != hana::int_c<0>;
  18 };
  19
  20 BOOST_HANA_CONSTANT_CHECK(hana::find_if(hana::just(hana::int_c<3>), odd) == hana::just(hana::int_c<3>));
  21 BOOST_HANA_CONSTANT_CHECK(hana::find_if(hana::just(hana::int_c<2>), odd) == hana::nothing);
  22 BOOST_HANA_CONSTANT_CHECK(hana::find_if(hana::nothing, odd) == hana::nothing);
  23
  24 BOOST_HANA_CONSTANT_CHECK(hana::all_of(hana::just(hana::int_c<3>), odd));
  25 BOOST_HANA_CONSTANT_CHECK(hana::all_of(hana::nothing, odd));
  26
  27 int main() { }