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

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