| 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/assert.hpp> |
| 7 | #include <boost/hana/at.hpp> |
| 8 | #include <boost/hana/define_struct.hpp> |
| 9 | #include <boost/hana/equal.hpp> |
| 10 | #include <boost/hana/first.hpp> |
| 11 | #include <boost/hana/integral_constant.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 | constexpr auto accessors = hana::accessors<Person>(); |
| 28 | BOOST_HANA_CONSTANT_CHECK( |
| 29 | hana::first(accessors[hana::size_c<0>]) == BOOST_HANA_STRING("name") |
| 30 | ); |
| 31 | |
| 32 | BOOST_HANA_CONSTANT_CHECK( |
| 33 | hana::first(accessors[hana::size_c<1>]) == BOOST_HANA_STRING("age") |
| 34 | ); |
| 35 | |
| 36 | constexpr auto get_name = hana::second(accessors[hana::size_c<0>]); |
| 37 | constexpr auto get_age = hana::second(accessors[hana::size_c<1>]); |
| 38 | |
| 39 | Person john{.name: "John", .age: 30}; |
| 40 | BOOST_HANA_RUNTIME_CHECK(get_name(john) == "John"); |
| 41 | BOOST_HANA_RUNTIME_CHECK(get_age(john) == 30); |
| 42 | } |
| 43 |