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- // 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/concept/logical.hpp>
- #include <boost/hana/equal.hpp>
- #include <boost/hana/eval_if.hpp>
- #include <boost/hana/functional/always.hpp>
- #include <boost/hana/not.hpp>
- #include <boost/hana/tuple.hpp>
- #include <boost/hana/while.hpp>
- #include <laws/logical.hpp>
- #include <vector>
- namespace hana = boost::hana;
- int main() {
- hana::test::TestLogical<bool>{hana::make_tuple(true, false)};
- // eval_if
- {
- BOOST_HANA_CONSTEXPR_CHECK(hana::equal(
- hana::eval_if(true, hana::always(1), hana::always(2)),
- 1
- ));
- BOOST_HANA_CONSTEXPR_CHECK(hana::equal(
- hana::eval_if(false, hana::always(1), hana::always(2)),
- 2
- ));
- }
- // not_
- {
- BOOST_HANA_CONSTEXPR_CHECK(hana::equal(hana::not_(true), false));
- BOOST_HANA_CONSTEXPR_CHECK(hana::equal(hana::not_(false), true));
- }
- // while_
- {
- auto less_than = [](auto n) {
- return [n](auto v) { return v.size() < n; };
- };
- auto f = [](auto v) {
- v.push_back(v.size());
- return v;
- };
- BOOST_HANA_RUNTIME_CHECK(hana::equal(
- hana::while_(less_than(0u), std::vector<int>{}, f),
- std::vector<int>{}
- ));
- BOOST_HANA_RUNTIME_CHECK(hana::equal(
- hana::while_(less_than(1u), std::vector<int>{}, f),
- std::vector<int>{0}
- ));
- BOOST_HANA_RUNTIME_CHECK(hana::equal(
- hana::while_(less_than(2u), std::vector<int>{}, f),
- std::vector<int>{0, 1}
- ));
- BOOST_HANA_RUNTIME_CHECK(hana::equal(
- hana::while_(less_than(3u), std::vector<int>{}, f),
- std::vector<int>{0, 1, 2}
- ));
- BOOST_HANA_RUNTIME_CHECK(hana::equal(
- hana::while_(less_than(4u), std::vector<int>{}, f),
- std::vector<int>{0, 1, 2, 3}
- ));
- // Make sure it can be called with an lvalue state:
- std::vector<int> v{};
- BOOST_HANA_RUNTIME_CHECK(hana::equal(
- hana::while_(less_than(4u), v, f),
- std::vector<int>{0, 1, 2, 3}
- ));
- }
- }
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