libcxx/test/std/containers/sequences/vector.bool/const_reference.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 // <vector>
  10
  11 #include <cassert>
  12 #include <vector>
  13
  14 #include "test_macros.h"
  15
  16 TEST_CONSTEXPR_CXX20 bool test() {
  17   using CRefT = std::vector<bool>::const_reference;
  18 #if !defined(_LIBCPP_VERSION) || defined(_LIBCPP_ABI_BITSET_VECTOR_BOOL_CONST_SUBSCRIPT_RETURN_BOOL)
  19   ASSERT_SAME_TYPE(CRefT, bool);
  20 #else
  21   ASSERT_SAME_TYPE(CRefT, std::__bit_const_reference<std::vector<bool> >);
  22   std::vector<bool> vec;
  23   vec.push_back(true);
  24   CRefT ref = vec[0];
  25   assert(ref);
  26   vec[0] = false;
  27   assert(!ref);
  28 #endif
  29
  30   return true;
  31 }
  32
  33 int main(int, char**) {
  34   test();
  35 #if TEST_STD_VER > 17
  36     static_assert(test());
  37 #endif
  38
  39   return 0;
  40 }