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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/equal.hpp>
- #include <boost/hana/if.hpp>
- #include <boost/hana/integral_constant.hpp>
- #include <boost/hana/minus.hpp>
- #include <boost/hana/optional.hpp>
- #include <boost/hana/pair.hpp>
- #include <boost/hana/tuple.hpp>
- #include <boost/hana/unfold_right.hpp>
- namespace hana = boost::hana;
- BOOST_HANA_CONSTANT_CHECK(
- hana::unfold_right<hana::tuple_tag>(hana::int_c<10>, [](auto x) {
- return hana::if_(x == hana::int_c<0>,
- hana::nothing,
- hana::just(hana::make_pair(x, x - hana::int_c<1>))
- );
- })
- ==
- hana::tuple_c<int, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1>
- );
- int main() { }
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