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60 lines
1.7 KiB
C++
60 lines
1.7 KiB
C++
/*
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@copyright Louis Dionne 2014
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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/detail/assert.hpp>
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#include <boost/hana/detail/constexpr.hpp>
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#include <boost/hana/foreign.hpp>
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#include <boost/hana/map.hpp>
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#include <boost/hana/pair.hpp>
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#include <boost/hana/tuple.hpp>
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#include <boost/hana/type.hpp>
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#include <boost/hana/record/mcd.hpp>
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#include <boost/hana/comparable/record_mcd.hpp>
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#include <boost/hana/foldable/record_mcd.hpp>
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#include <boost/hana/searchable/record_mcd.hpp>
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#include <string>
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using namespace boost::hana;
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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 = decltype_(&Person::name);
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constexpr auto age = decltype_(&Person::age);
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namespace boost { namespace hana {
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template <>
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struct Record::instance<Person> : Record::mcd {
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static BOOST_HANA_CONSTEXPR_LAMBDA auto members_impl() {
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return tuple(
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pair(name, [](auto p) { return p.name; }),
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pair(age, [](auto p) { return p.age; })
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);
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}
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};
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}}
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int main() {
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Person john{"John", 30}, bob{"Bob", 40};
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BOOST_HANA_RUNTIME_ASSERT(equal(john, john));
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BOOST_HANA_RUNTIME_ASSERT(not_equal(john, bob));
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BOOST_HANA_RUNTIME_ASSERT(lookup(john, name) == just("John"));
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BOOST_HANA_RUNTIME_ASSERT(lookup(john, age) == just(30));
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BOOST_HANA_CONSTANT_ASSERT(lookup(john, "clearly not a member") == nothing);
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BOOST_HANA_RUNTIME_ASSERT(to<Tuple>(john) == tuple("John", 30));
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BOOST_HANA_RUNTIME_ASSERT(to<Map>(john) == map(
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pair(name, "John"),
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pair(age, 30)
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));
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}
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