29 lines
849 B
C++
29 lines
849 B
C++
// Copyright Louis Dionne 2013-2017
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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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#include <boost/hana/assert.hpp>
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#include <boost/hana/equal.hpp>
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#include <boost/hana/if.hpp>
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#include <boost/hana/integral_constant.hpp>
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#include <boost/hana/minus.hpp>
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#include <boost/hana/optional.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/unfold_left.hpp>
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namespace hana = boost::hana;
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BOOST_HANA_CONSTANT_CHECK(
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hana::unfold_left<hana::tuple_tag>(hana::int_c<10>, [](auto x) {
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return hana::if_(x == hana::int_c<0>,
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hana::nothing,
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hana::just(hana::make_pair(x - hana::int_c<1>, x))
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);
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})
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==
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hana::tuple_c<int, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10>
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);
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int main() { }
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