// 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_left.hpp> namespace hana = boost::hana; BOOST_HANA_CONSTANT_CHECK( hana::unfold_left<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 - hana::int_c<1>, x)) ); }) == hana::tuple_c<int, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10> ); int main() { }