77 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8 9// bitset<N>::reference operator[](size_t pos); // constexpr since C++2310 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 limits71#if TEST_STD_VER > 2072 static_assert(test());73#endif74 75 return 0;76}77