92 lines
2.5 KiB
C++
92 lines
2.5 KiB
C++
// Copyright Louis Dionne 2013-2017
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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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#ifndef BOOST_HANA_TEST_AUTO_AT_HPP
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#define BOOST_HANA_TEST_AUTO_AT_HPP
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#include <boost/hana/assert.hpp>
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#include <boost/hana/at.hpp>
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#include <boost/hana/equal.hpp>
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#include <boost/hana/integral_constant.hpp>
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#include "test_case.hpp"
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#include <laws/base.hpp>
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#include <support/tracked.hpp>
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namespace _test_at_detail { template <int> struct invalid { }; }
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TestCase test_at{[]{
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namespace hana = boost::hana;
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using hana::test::ct_eq;
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using _test_at_detail::invalid;
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::at(MAKE_TUPLE(ct_eq<0>{}), hana::size_c<0>),
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ct_eq<0>{}
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));
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::at(MAKE_TUPLE(ct_eq<0>{}, invalid<1>{}), hana::size_c<0>),
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ct_eq<0>{}
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));
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::at(MAKE_TUPLE(invalid<0>{}, ct_eq<1>{}), hana::size_c<1>),
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ct_eq<1>{}
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));
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::at(MAKE_TUPLE(invalid<0>{}, ct_eq<1>{}, invalid<2>{}), hana::size_c<1>),
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ct_eq<1>{}
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));
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::at(MAKE_TUPLE(invalid<0>{}, invalid<1>{}, ct_eq<2>{}), hana::size_c<2>),
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ct_eq<2>{}
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));
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::at(MAKE_TUPLE(invalid<0>{}, invalid<1>{}, ct_eq<2>{}, invalid<3>{}), hana::size_c<2>),
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ct_eq<2>{}
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));
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#ifndef MAKE_TUPLE_NO_CONSTEXPR
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static_assert(hana::equal(
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hana::at(MAKE_TUPLE(1), hana::size_c<0>),
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1
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), "");
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static_assert(hana::equal(
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hana::at(MAKE_TUPLE(1, '2'), hana::size_c<0>),
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1
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), "");
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static_assert(hana::equal(
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hana::at(MAKE_TUPLE(1, '2', 3.3), hana::size_c<0>),
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1
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), "");
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static_assert(hana::equal(
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hana::at(MAKE_TUPLE(1, '2'), hana::size_c<1>),
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'2'
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), "");
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static_assert(hana::equal(
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hana::at(MAKE_TUPLE(1, '2', 3.3), hana::size_c<1>),
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'2'
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), "");
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static_assert(hana::equal(
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hana::at(MAKE_TUPLE(1, '2', 3.3), hana::size_c<2>),
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3.3
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), "");
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#endif
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// make sure we can use non-pods on both sides
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{
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// store the result to make sure `at` is executed.
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auto result = hana::at(MAKE_TUPLE(Tracked{0}, ct_eq<1>{}, Tracked{1}), hana::size_c<1>);;
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BOOST_HANA_CONSTANT_CHECK(hana::equal(result, ct_eq<1>{}));
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}
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}};
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#endif // !BOOST_HANA_TEST_AUTO_AT_HPP
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