libcxx/test/std/utilities/template.bitset/bitset.members/index.pass.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-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>
  20 TEST_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
  49 TEST_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
  68 int 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 }