56 lines
1.7 KiB
C++
56 lines
1.7 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_IS_EMPTY_HPP
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#define BOOST_HANA_TEST_AUTO_IS_EMPTY_HPP
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#include <boost/hana/assert.hpp>
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#include <boost/hana/is_empty.hpp>
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#include <boost/hana/not.hpp>
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#include "test_case.hpp"
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namespace _test_is_empty_detail { template <int i> struct undefined { }; }
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TestCase test_is_empty{[]{
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namespace hana = boost::hana;
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using _test_is_empty_detail::undefined;
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BOOST_HANA_CONSTANT_CHECK(hana::is_empty(
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MAKE_TUPLE()
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));
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BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::is_empty(
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MAKE_TUPLE(undefined<0>{})
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)));
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BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::is_empty(
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MAKE_TUPLE(undefined<0>{}, undefined<1>{})
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)));
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BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::is_empty(
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MAKE_TUPLE(undefined<0>{}, undefined<1>{}, undefined<2>{})
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)));
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BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::is_empty(
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MAKE_TUPLE(undefined<0>{}, undefined<1>{}, undefined<2>{}, undefined<3>{})
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)));
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// Check with a runtime value
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{
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int i = 3; // <- runtime value
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BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::is_empty(MAKE_TUPLE(i))));
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BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::is_empty(MAKE_TUPLE(i, i))));
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}
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#ifndef MAKE_TUPLE_NO_CONSTEXPR
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static_assert(hana::is_empty(MAKE_TUPLE()), "");
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static_assert(hana::not_(hana::is_empty(MAKE_TUPLE(undefined<0>{}))), "");
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static_assert(hana::not_(hana::is_empty(MAKE_TUPLE(undefined<0>{}, undefined<1>{}))), "");
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#endif
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}};
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#endif // !BOOST_HANA_TEST_AUTO_IS_EMPTY_HPP
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