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 operator[](size_type) const; // constexpr in C++14
12// Libc++ marks it as noexcept
13
14#include <array>
15#include <cassert>
16
17#include "test_macros.h"
18
19TEST_CONSTEXPR_CXX14 bool tests()
20{
21 {
22 typedef double T;
23 typedef std::array<T, 3> C;
24 C const c = {1, 2, 3.5};
25 LIBCPP_ASSERT_NOEXCEPT(c[0]);
26 ASSERT_SAME_TYPE(C::const_reference, decltype(c[0]));
27 C::const_reference r1 = c[0];
28 assert(r1 == 1);
29 C::const_reference r2 = c[2];
30 assert(r2 == 3.5);
31 }
32 // Test operator[] "works" on zero sized arrays
33 {
34 {
35 typedef double T;
36 typedef std::array<T, 0> C;
37 C const c = {};
38 LIBCPP_ASSERT_NOEXCEPT(c[0]);
39 ASSERT_SAME_TYPE(C::const_reference, decltype(c[0]));
40 if (c.size() > (0)) { // always false
41 C::const_reference r = c[0];
42 (void)r;
43 }
44 }
45 {
46 typedef double T;
47 typedef std::array<T const, 0> C;
48 C const c = {};
49 LIBCPP_ASSERT_NOEXCEPT(c[0]);
50 ASSERT_SAME_TYPE(C::const_reference, decltype(c[0]));
51 if (c.size() > (0)) { // always false
52 C::const_reference r = c[0];
53 (void)r;
54 }
55 }
56 }
57
58 return true;
59}
60
61int main(int, char**)
62{
63 tests();
64#if TEST_STD_VER >= 14
65 static_assert(tests(), "");
66#endif
67 return 0;
68}
69

source code of libcxx/test/std/containers/sequences/array/indexing_const.pass.cpp