ceph/src/boost/libs/hana/example/struct/searchable.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/accessors.hpp>
   6 #include <boost/hana/all_of.hpp>
   7 #include <boost/hana/assert.hpp>
   8 #include <boost/hana/define_struct.hpp>
   9 #include <boost/hana/equal.hpp>
  10 #include <boost/hana/find.hpp>
  11 #include <boost/hana/optional.hpp>
  12 #include <boost/hana/second.hpp>
  13 #include <boost/hana/string.hpp>
  14
  15 #include <string>
  16 namespace hana = boost::hana;
  17
  18
  19 struct Person {
  20     BOOST_HANA_DEFINE_STRUCT(Person,
  21         (std::string, name),
  22         (unsigned short, age)
  23     );
  24 };
  25
  26 int main() {
  27     Person john{"John", 30};
  28
  29     BOOST_HANA_RUNTIME_CHECK(
  30         hana::find(john, BOOST_HANA_STRING("name")) == hana::just("John")
  31     );
  32
  33     BOOST_HANA_CONSTANT_CHECK(
  34         hana::find(john, BOOST_HANA_STRING("foobar")) == hana::nothing
  35     );
  36
  37
  38     BOOST_HANA_RUNTIME_CHECK(
  39         hana::all_of(hana::accessors<Person>(), [&](auto a) {
  40             return hana::second(a)(john) == hana::second(a)(john);
  41         })
  42     );
  43
  44     // the above is equivalent to:
  45     BOOST_HANA_RUNTIME_CHECK(hana::equal(john, john));
  46 }