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)
4 
5 #include <boost/hana/assert.hpp>
6 #include <boost/hana/equal.hpp>
7 #include <boost/hana/optional.hpp>
8 #include <boost/hana/unpack.hpp>
9 
10 #include <laws/base.hpp>
11 namespace hana = boost::hana;
12 
13 
main()14 int main() {
15     hana::test::ct_eq<2> x{};
16     hana::test::_injection<0> f{};
17 
18     BOOST_HANA_CONSTANT_CHECK(hana::equal(
19         hana::unpack(hana::nothing, f),
20         f()
21     ));
22 
23     BOOST_HANA_CONSTANT_CHECK(hana::equal(
24         hana::unpack(hana::just(x), f),
25         f(x)
26     ));
27 
28     // Previously, there was a bug that would make this fail.
29     auto non_const_nothing = hana::nothing;
30     BOOST_HANA_CONSTANT_CHECK(hana::equal(
31         hana::unpack(non_const_nothing, f),
32         f()
33     ));
34 }
35