blob: 9caa90f2567f5c368752d2c509770563744acafe (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// <array>
// reference operator[](size_type); // constexpr in C++17
// Libc++ marks it as noexcept
#include <array>
#include <cassert>
#include "test_macros.h"
TEST_CONSTEXPR_CXX17 bool tests() {
{
typedef double T;
typedef std::array<T, 3> C;
C c = {1, 2, 3.5};
LIBCPP_ASSERT_NOEXCEPT(c[0]);
ASSERT_SAME_TYPE(C::reference, decltype(c[0]));
C::reference r1 = c[0];
assert(r1 == 1);
r1 = 5.5;
assert(c.front() == 5.5);
C::reference r2 = c[2];
assert(r2 == 3.5);
r2 = 7.5;
assert(c.back() == 7.5);
}
// Test operator[] "works" on zero sized arrays
{
{
typedef double T;
typedef std::array<T, 0> C;
C c = {};
LIBCPP_ASSERT_NOEXCEPT(c[0]);
ASSERT_SAME_TYPE(C::reference, decltype(c[0]));
if (c.size() > (0)) { // always false
C::reference r = c[0];
(void)r;
}
}
{
typedef double T;
typedef std::array<const T, 0> C;
C c = {};
LIBCPP_ASSERT_NOEXCEPT(c[0]);
ASSERT_SAME_TYPE(C::reference, decltype(c[0]));
if (c.size() > (0)) { // always false
C::reference r = c[0];
(void)r;
}
}
}
return true;
}
int main(int, char**) {
tests();
#if TEST_STD_VER >= 17
static_assert(tests(), "");
#endif
return 0;
}
|
