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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/concept/metafunction.hpp> | |
7 | #include <boost/hana/equal.hpp> | |
8 | #include <boost/hana/type.hpp> | |
9 | ||
10 | #include <type_traits> | |
11 | namespace hana = boost::hana; | |
12 | ||
13 | ||
14 | struct x1; struct x2; struct x3; | |
15 | struct y1 { }; struct y2 { }; struct y3 { }; | |
16 | template <typename ...> struct f; | |
17 | ||
18 | BOOST_HANA_CONSTANT_CHECK(hana::equal( | |
19 | hana::template_<f>(), | |
20 | hana::type_c<f<>> | |
21 | )); | |
22 | BOOST_HANA_CONSTANT_CHECK(hana::equal( | |
23 | hana::template_<f>(hana::type_c<x1>), | |
24 | hana::type_c<f<x1>> | |
25 | )); | |
26 | BOOST_HANA_CONSTANT_CHECK(hana::equal( | |
27 | hana::template_<f>(hana::type_c<x1>, hana::type_c<x2>), | |
28 | hana::type_c<f<x1, x2>> | |
29 | )); | |
30 | BOOST_HANA_CONSTANT_CHECK(hana::equal( | |
31 | hana::template_<f>(hana::type_c<x1>, hana::type_c<x2>, hana::type_c<x3>), | |
32 | hana::type_c<f<x1, x2, x3>> | |
33 | )); | |
34 | ||
35 | using F = decltype(hana::template_<f>); | |
36 | static_assert(std::is_same<F::apply<>::type, f<>>{}, ""); | |
37 | static_assert(std::is_same<F::apply<x1>::type, f<x1>>{}, ""); | |
38 | static_assert(std::is_same<F::apply<x1, x2>::type, f<x1, x2>>{}, ""); | |
39 | static_assert(std::is_same<F::apply<x1, x2, x3>::type, f<x1, x2, x3>>{}, ""); | |
40 | ||
41 | // Make sure we model the Metafunction concept | |
42 | static_assert(hana::Metafunction<decltype(hana::template_<f>)>::value, ""); | |
43 | static_assert(hana::Metafunction<decltype(hana::template_<f>)&>::value, ""); | |
44 | ||
45 | // Make sure we can use aliases | |
46 | template <typename T> using alias = T; | |
47 | static_assert(hana::template_<alias>(hana::type_c<x1>) == hana::type_c<x1>, ""); | |
48 | ||
49 | ||
50 | // Make sure we don't read from a non-constexpr variable | |
51 | int main() { | |
52 | auto t = hana::type_c<x1>; | |
53 | constexpr auto r = hana::template_<f>(t); | |
54 | (void)r; | |
55 | } |