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27 lines
751 B
C++
27 lines
751 B
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/constexpr.hpp>
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#include <boost/hana/detail/static_assert.hpp>
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#include <boost/hana/integer_list.hpp>
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#include <boost/hana/integral.hpp>
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#include <boost/hana/maybe.hpp>
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#include <boost/hana/pair/instance.hpp>
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using namespace boost::hana;
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int main() {
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//! [main]
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BOOST_HANA_CONSTEXPR_LAMBDA auto f = [](auto x) {
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return if_(x == int_<0>, nothing, just(pair(x, x - int_<1>)));
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};
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BOOST_HANA_STATIC_ASSERT(
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unfoldr<IntegerList>(f, int_<10>) == integer_list<int, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1>
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);
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//! [main]
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}
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