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- // Copyright Louis Dionne 2013-2017
- // Distributed under the Boost Software License, Version 1.0.
- // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
- #include <boost/hana/assert.hpp>
- #include <boost/hana/define_struct.hpp>
- #include <boost/hana/fold_left.hpp>
- #include <boost/hana/second.hpp>
- namespace hana = boost::hana;
- struct Kitten {
- BOOST_HANA_DEFINE_STRUCT(Kitten,
- (int, extremely_cute),
- (int, cute),
- (int, not_so_cute)
- );
- };
- int main() {
- constexpr Kitten kitten{5, 10, 0};
- BOOST_HANA_CONSTEXPR_CHECK(
- hana::fold_left(kitten, 0, [](auto total, auto member) {
- // first(member) is the name of the member, here
- // "extremely_cute", or "cute" or "not_so_cute",
- // and second(member) is its value.
- return hana::second(member) + total;
- }) == (5 + 10 + 0)
- );
- }
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