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// bitset<N>::reference operator[](size_t pos); // constexpr since C++23
10
11#include <bitset>
12#include <cassert>
13#include <cstddef>
14#include <vector>
15
16#include "../bitset_test_cases.h"
17#include "test_macros.h"
18
19template <std::size_t N>
20TEST_CONSTEXPR_CXX23 void test_index() {
21 std::vector<std::bitset<N> > const cases = get_test_cases<N>();
22 for (std::size_t c = 0; c != cases.size(); ++c) {
23 std::bitset<N> v1 = cases[c];
24 if (v1.size() > 0) {
25 assert(v1[N/2] == v1.test(N/2));
26 typename std::bitset<N>::reference r = v1[N/2];
27 assert(r == v1.test(N/2));
28 typename std::bitset<N>::reference r2 = v1[N/2];
29 r = r2;
30 assert(r == v1.test(N/2));
31 r = false;
32 assert(r == false);
33 assert(v1.test(N/2) == false);
34 r = true;
35 assert(r == true);
36 assert(v1.test(N/2) == true);
37 bool b = ~r;
38 assert(r == true);
39 assert(v1.test(N/2) == true);
40 assert(b == false);
41 r.flip();
42 assert(r == false);
43 assert(v1.test(N/2) == false);
44 }
45 ASSERT_SAME_TYPE(decltype(v1[0]), typename std::bitset<N>::reference);
46 }
47}
48
49TEST_CONSTEXPR_CXX23 bool test() {
50 test_index<0>();
51 test_index<1>();
52 test_index<31>();
53 test_index<32>();
54 test_index<33>();
55 test_index<63>();
56 test_index<64>();
57 test_index<65>();
58
59 std::bitset<1> set;
60 set[0] = false;
61 auto b = set[0];
62 set[0] = true;
63 assert(b);
64
65 return true;
66}
67
68int main(int, char**) {
69 test();
70 test_index<1000>(); // not in constexpr because of constexpr evaluation step limits
71#if TEST_STD_VER > 20
72 static_assert(test());
73#endif
74
75 return 0;
76}
77

source code of libcxx/test/std/utilities/template.bitset/bitset.members/index.pass.cpp