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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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