1// Copyright Louis Dionne 2013-2022
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/adapt_struct.hpp>
7#include <boost/hana/assert.hpp>
8#include <boost/hana/core/to.hpp>
9#include <boost/hana/equal.hpp>
10#include <boost/hana/find.hpp>
11#include <boost/hana/first.hpp>
12#include <boost/hana/map.hpp>
13#include <boost/hana/not_equal.hpp>
14#include <boost/hana/optional.hpp>
15#include <boost/hana/pair.hpp>
16#include <boost/hana/string.hpp>
17#include <boost/hana/transform.hpp>
18#include <boost/hana/tuple.hpp>
19
20#include <string>
21namespace hana = boost::hana;
22
23
24namespace ns {
25 struct Person {
26 std::string name;
27 int age;
28 };
29}
30
31BOOST_HANA_ADAPT_STRUCT(ns::Person,
32 name,
33 age
34);
35
36// The member names are hana::strings:
37auto names = hana::transform(hana::accessors<ns::Person>(), hana::first);
38BOOST_HANA_CONSTANT_CHECK(
39 names == hana::make_tuple(BOOST_HANA_STRING("name"), BOOST_HANA_STRING("age"))
40);
41
42int main() {
43 ns::Person john{.name: "John", .age: 30}, bob{.name: "Bob", .age: 40};
44 BOOST_HANA_RUNTIME_CHECK(hana::equal(john, john));
45 BOOST_HANA_RUNTIME_CHECK(hana::not_equal(john, bob));
46
47 BOOST_HANA_RUNTIME_CHECK(hana::find(john, BOOST_HANA_STRING("name")) == hana::just("John"));
48 BOOST_HANA_RUNTIME_CHECK(hana::find(john, BOOST_HANA_STRING("age")) == hana::just(30));
49 BOOST_HANA_CONSTANT_CHECK(hana::find(john, BOOST_HANA_STRING("foo")) == hana::nothing);
50
51 BOOST_HANA_RUNTIME_CHECK(hana::to_tuple(john) == hana::make_tuple(
52 hana::make_pair(BOOST_HANA_STRING("name"), "John"),
53 hana::make_pair(BOOST_HANA_STRING("age"), 30)
54 ));
55
56 BOOST_HANA_RUNTIME_CHECK(hana::to_map(john) == hana::make_map(
57 hana::make_pair(BOOST_HANA_STRING("name"), "John"),
58 hana::make_pair(BOOST_HANA_STRING("age"), 30)
59 ));
60}
61

source code of boost/libs/hana/example/adapt_struct.cpp