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 19 template <std::size_t N> test_index()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 test()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 main(int,char **)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