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 | // <array> |
10 | |
11 | // const_reference front() const; // constexpr in C++14 |
12 | // const_reference back() const; // constexpr in C++14 |
13 | |
14 | #include <array> |
15 | #include <cassert> |
16 | |
17 | #include "test_macros.h" |
18 | |
19 | TEST_CONSTEXPR_CXX14 bool tests() { |
20 | { |
21 | typedef double T; |
22 | typedef std::array<T, 3> C; |
23 | C const c = {1, 2, 3.5}; |
24 | C::const_reference r1 = c.front(); |
25 | assert(r1 == 1); |
26 | |
27 | C::const_reference r2 = c.back(); |
28 | assert(r2 == 3.5); |
29 | } |
30 | { |
31 | typedef double T; |
32 | typedef std::array<T, 0> C; |
33 | C const c = {}; |
34 | ASSERT_SAME_TYPE(decltype(c.back()), C::const_reference); |
35 | LIBCPP_ASSERT_NOEXCEPT(c.back()); |
36 | ASSERT_SAME_TYPE(decltype(c.front()), C::const_reference); |
37 | LIBCPP_ASSERT_NOEXCEPT(c.front()); |
38 | if (c.size() > (0)) { // always false |
39 | TEST_IGNORE_NODISCARD c.front(); |
40 | TEST_IGNORE_NODISCARD c.back(); |
41 | } |
42 | } |
43 | { |
44 | typedef double T; |
45 | typedef std::array<const T, 0> C; |
46 | C const c = {}; |
47 | ASSERT_SAME_TYPE(decltype(c.back()), C::const_reference); |
48 | LIBCPP_ASSERT_NOEXCEPT(c.back()); |
49 | ASSERT_SAME_TYPE(decltype(c.front()), C::const_reference); |
50 | LIBCPP_ASSERT_NOEXCEPT(c.front()); |
51 | if (c.size() > (0)) { |
52 | TEST_IGNORE_NODISCARD c.front(); |
53 | TEST_IGNORE_NODISCARD c.back(); |
54 | } |
55 | } |
56 | |
57 | return true; |
58 | } |
59 | |
60 | int main(int, char**) { |
61 | tests(); |
62 | #if TEST_STD_VER >= 14 |
63 | static_assert(tests(), "" ); |
64 | #endif |
65 | return 0; |
66 | } |
67 | |