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72 lines
2.2 KiB
C++
72 lines
2.2 KiB
C++
/*
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@copyright Louis Dionne 2015
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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*/
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#include <boost/hana/assert.hpp>
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#include <boost/hana/config.hpp>
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#include <boost/hana/core/convert.hpp>
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#include <boost/hana/equal.hpp>
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#include <boost/hana/find.hpp>
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#include <boost/hana/functional/id.hpp>
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#include <boost/hana/fwd/accessors.hpp>
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#include <boost/hana/integral_constant.hpp>
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#include <boost/hana/map.hpp>
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#include <boost/hana/not_equal.hpp>
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#include <boost/hana/pair.hpp>
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#include <boost/hana/string.hpp>
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#include <boost/hana/tuple.hpp>
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#include <string>
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#include <utility>
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namespace hana = boost::hana;
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//! [main]
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struct Person {
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std::string name;
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int age;
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};
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// The keys can be anything as long as they are compile-time comparable.
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constexpr auto name = hana::integral_c<std::string Person::*, &Person::name>;
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constexpr auto age = hana::string_c<'a', 'g', 'e'>;
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namespace boost { namespace hana {
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template <>
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struct accessors_impl<Person> {
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static BOOST_HANA_CONSTEXPR_LAMBDA auto apply() {
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return make_tuple(
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make_pair(name, [](auto&& p) -> decltype(auto) {
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return id(std::forward<decltype(p)>(p).name);
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}),
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make_pair(age, [](auto&& p) -> decltype(auto) {
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return id(std::forward<decltype(p)>(p).age);
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})
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);
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}
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};
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}}
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//! [main]
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int main() {
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Person john{"John", 30}, bob{"Bob", 40};
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BOOST_HANA_RUNTIME_CHECK(hana::equal(john, john));
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BOOST_HANA_RUNTIME_CHECK(hana::not_equal(john, bob));
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BOOST_HANA_RUNTIME_CHECK(hana::find(john, name) == hana::just("John"));
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BOOST_HANA_RUNTIME_CHECK(hana::find(john, age) == hana::just(30));
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BOOST_HANA_CONSTANT_CHECK(hana::find(john, BOOST_HANA_STRING("foo")) == hana::nothing);
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BOOST_HANA_RUNTIME_CHECK(hana::to<hana::tuple_tag>(john) == hana::make_tuple(
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hana::make_pair(name, "John"),
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hana::make_pair(age, 30)
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));
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BOOST_HANA_RUNTIME_CHECK(hana::to<hana::map_tag>(john) == hana::make_map(
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hana::make_pair(name, "John"),
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hana::make_pair(age, 30)
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));
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}
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