1 // Copyright Louis Dionne 2013-2017
2 // Distributed under the Boost Software License, Version 1.0.
3 // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
5 #include <boost/hana/assert.hpp>
6 #include <boost/hana/equal.hpp>
7 #include <boost/hana/type.hpp>
10 namespace hana = boost::hana;
13 // This test checks that the unary + operator on types works as expected.
14 // The unary + operator is supposed to turn a reference to a hana::type
15 // object into an equivalent prvalue.
20 auto& ref = hana::type_c<T>;
21 auto const& cref = hana::type_c<T>;
22 auto&& rref = hana::type_c<T>;
23 auto val = hana::type_c<T>;
25 BOOST_HANA_CONSTANT_CHECK(hana::equal(val, +val));
26 BOOST_HANA_CONSTANT_CHECK(hana::equal(val, +ref));
27 BOOST_HANA_CONSTANT_CHECK(hana::equal(val, +cref));
28 BOOST_HANA_CONSTANT_CHECK(hana::equal(val, +rref));
30 static_assert(!std::is_reference<decltype(+val)>{}, "");
31 static_assert(!std::is_reference<decltype(+ref)>{}, "");
32 static_assert(!std::is_reference<decltype(+cref)>{}, "");
33 static_assert(!std::is_reference<decltype(+rref)>{}, "");
35 using T1 = decltype(+val)::type;
36 using T2 = decltype(+ref)::type;
37 using T3 = decltype(+cref)::type;
38 using T4 = decltype(+rref)::type;