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47 lines
1.3 KiB
C++
47 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/list.hpp>
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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/functional.hpp>
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#include <boost/hana/integral.hpp>
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using namespace boost::hana;
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BOOST_HANA_CONSTEXPR_LAMBDA auto permute = [](auto xs) {
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return [=](auto ...expected_) {
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auto actual = permutations(xs);
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auto expected = list(expected_...);
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//! @todo
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//! This is a cheap unordered container membership checking.
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//! Use a real unordered container instead.
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BOOST_HANA_STATIC_ASSERT(
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length(expected) == length(actual) &&
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all([=](auto x) { return elem(x, expected); }, actual)
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);
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};
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};
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int main() {
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permute(list_c<int>)(list_c<int>);
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permute(list_c<int, 0>)(list_c<int, 0>);
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permute(list_c<int, 0, 1>)(
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list_c<int, 0, 1>,
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list_c<int, 1, 0>
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);
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permute(list_c<int, 0, 1, 2>)(
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list_c<int, 0, 1, 2>,
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list_c<int, 0, 2, 1>,
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list_c<int, 1, 0, 2>,
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list_c<int, 1, 2, 0>,
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list_c<int, 2, 0, 1>,
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list_c<int, 2, 1, 0>
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);
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}
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