1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 // UNSUPPORTED: c++03, c++11, c++14, c++17
10 
11 // <array>
12 
13 // LWG-3382 NTTP for pair and array:
14 // Two values a1 and a2 of type array<T, N> are template-argument-equivalent if and only if each pair of corresponding
15 // elements in a1 and a2 are template-argument-equivalent.
16 
17 #include <array>
18 
19 #include <type_traits>
20 
21 namespace test_full_type {
22 template <class T, std::size_t S, std::array<T, S> A>
23 struct test : std::false_type {};
24 
25 template <>
26 struct test<int, 3, std::array<int, 3>{1, 2, 3}> : std::true_type {};
27 
28 static_assert(!test<int*, 4, std::array<int*, 4>{}>::value);
29 static_assert(!test<int*, 3, std::array<int*, 3>{}>::value);
30 static_assert(!test<int, 3, std::array<int, 3>{}>::value);
31 static_assert(!test<int, 3, std::array<int, 3>{1}>::value);
32 static_assert(!test<int, 3, std::array<int, 3>{1, 2}>::value);
33 static_assert(!test<long, 3, std::array<long, 3>{1, 2, 3}>::value);
34 static_assert(!test<unsigned int, 3, std::array<unsigned int, 3>{1, 2, 3}>::value);
35 static_assert(test<int, 3, std::array<int, 3>{1, 2, 3}>::value);
36 } // namespace test_full_type
37 
38 namespace test_ctad {
39 template <std::array A>
40 struct test : std::false_type {};
41 
42 template <>
43 struct test<std::array<int, 3>{4, 5, 6}> : std::true_type {};
44 
45 static_assert(!test<std::array<int*, 4>{}>::value);
46 static_assert(!test<std::array<int*, 3>{}>::value);
47 static_assert(!test<std::array<int, 3>{}>::value);
48 static_assert(!test<std::array<int, 3>{4}>::value);
49 static_assert(!test<std::array<int, 3>{4, 5}>::value);
50 static_assert(!test<std::array<long, 3>{4, 5, 6}>::value);
51 static_assert(!test<std::array<unsigned int, 3>{4, 5, 6}>::value);
52 static_assert(test<std::array<int, 3>{4, 5, 6}>::value);
53 } // namespace test_ctad
54 
55 namespace test_auto {
56 template <auto A>
57 struct test : std::false_type {};
58 
59 template <>
60 struct test<std::array<int, 3>{7, 8, 9}> : std::true_type {};
61 
62 static_assert(!test<std::array<int*, 4>{}>::value);
63 static_assert(!test<std::array<int*, 3>{}>::value);
64 static_assert(!test<std::array<int, 3>{}>::value);
65 static_assert(!test<std::array<int, 3>{7}>::value);
66 static_assert(!test<std::array<int, 3>{7, 8}>::value);
67 static_assert(!test<std::array<long, 3>{7, 8, 9}>::value);
68 static_assert(!test<std::array<unsigned int, 3>{7, 8, 9}>::value);
69 static_assert(test<std::array<int, 3>{7, 8, 9}>::value);
70 } // namespace test_auto
71