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43 lines
1.3 KiB
C++
43 lines
1.3 KiB
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/sandbox/map.hpp>
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#include <boost/hana/detail/constexpr.hpp>
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#include <boost/hana/functional.hpp>
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#include <boost/hana/integral.hpp>
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#include <boost/hana/list.hpp>
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#include <boost/hana/pair.hpp>
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#include <cassert>
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using namespace boost::hana;
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using sandbox::map;
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BOOST_HANA_CONSTEXPR_LAMBDA auto check_fold = [](auto ...pairs) {
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auto values = fmap(second, list(pairs...));
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auto result = lazy_foldr(on(cons, apply), list(), map(pairs...));
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assert(elem(result, permutations(values)));
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};
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int main() {
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BOOST_HANA_CONSTEXPR_LAMBDA auto k1 = int_<1>;
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BOOST_HANA_CONSTEXPR_LAMBDA auto k2 = int_<2>;
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BOOST_HANA_CONSTEXPR_LAMBDA auto k3 = int_<3>;
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BOOST_HANA_CONSTEXPR_LAMBDA auto k4 = int_<4>;
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BOOST_HANA_CONSTEXPR_LAMBDA auto v1 = char_<'1'>;
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BOOST_HANA_CONSTEXPR_LAMBDA auto v2 = char_<'2'>;
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BOOST_HANA_CONSTEXPR_LAMBDA auto v3 = char_<'3'>;
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BOOST_HANA_CONSTEXPR_LAMBDA auto v4 = char_<'4'>;
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check_fold();
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check_fold(pair(k1, v1));
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check_fold(pair(k1, v1), pair(k2, v2));
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check_fold(pair(k1, v1), pair(k2, v2), pair(k3, v3));
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check_fold(pair(k1, v1), pair(k2, v2), pair(k3, v3), pair(k4, v4));
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}
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