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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)
- #ifndef BOOST_HANA_TEST_AUTO_AT_HPP
- #define BOOST_HANA_TEST_AUTO_AT_HPP
- #include <boost/hana/assert.hpp>
- #include <boost/hana/at.hpp>
- #include <boost/hana/equal.hpp>
- #include <boost/hana/integral_constant.hpp>
- #include "test_case.hpp"
- #include <laws/base.hpp>
- #include <support/tracked.hpp>
- namespace _test_at_detail { template <int> struct invalid { }; }
- TestCase test_at{[]{
- namespace hana = boost::hana;
- using hana::test::ct_eq;
- using _test_at_detail::invalid;
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::at(MAKE_TUPLE(ct_eq<0>{}), hana::size_c<0>),
- ct_eq<0>{}
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::at(MAKE_TUPLE(ct_eq<0>{}, invalid<1>{}), hana::size_c<0>),
- ct_eq<0>{}
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::at(MAKE_TUPLE(invalid<0>{}, ct_eq<1>{}), hana::size_c<1>),
- ct_eq<1>{}
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::at(MAKE_TUPLE(invalid<0>{}, ct_eq<1>{}, invalid<2>{}), hana::size_c<1>),
- ct_eq<1>{}
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::at(MAKE_TUPLE(invalid<0>{}, invalid<1>{}, ct_eq<2>{}), hana::size_c<2>),
- ct_eq<2>{}
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::at(MAKE_TUPLE(invalid<0>{}, invalid<1>{}, ct_eq<2>{}, invalid<3>{}), hana::size_c<2>),
- ct_eq<2>{}
- ));
- #ifndef MAKE_TUPLE_NO_CONSTEXPR
- static_assert(hana::equal(
- hana::at(MAKE_TUPLE(1), hana::size_c<0>),
- 1
- ), "");
- static_assert(hana::equal(
- hana::at(MAKE_TUPLE(1, '2'), hana::size_c<0>),
- 1
- ), "");
- static_assert(hana::equal(
- hana::at(MAKE_TUPLE(1, '2', 3.3), hana::size_c<0>),
- 1
- ), "");
- static_assert(hana::equal(
- hana::at(MAKE_TUPLE(1, '2'), hana::size_c<1>),
- '2'
- ), "");
- static_assert(hana::equal(
- hana::at(MAKE_TUPLE(1, '2', 3.3), hana::size_c<1>),
- '2'
- ), "");
- static_assert(hana::equal(
- hana::at(MAKE_TUPLE(1, '2', 3.3), hana::size_c<2>),
- 3.3
- ), "");
- #endif
- // make sure we can use non-pods on both sides
- {
- // store the result to make sure `at` is executed.
- auto result = hana::at(MAKE_TUPLE(Tracked{0}, ct_eq<1>{}, Tracked{1}), hana::size_c<1>);;
- BOOST_HANA_CONSTANT_CHECK(hana::equal(result, ct_eq<1>{}));
- }
- }};
- #endif // !BOOST_HANA_TEST_AUTO_AT_HPP
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