libcxx/test/std/containers/sequences/vector.bool/reference.swap.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 // vector<bool>
  11
  12 // static void swap(reference x, reference y) noexcept;
  13
  14 #include <vector>
  15 #include <cassert>
  16
  17 #include "test_macros.h"
  18
  19 TEST_CONSTEXPR_CXX20 bool tests()
  20 {
  21
  22     bool a[] = {false, true, false, true};
  23     bool* an = a + sizeof(a)/sizeof(a[0]);
  24
  25     std::vector<bool> v(a, an);
  26     std::vector<bool>::reference r1 = v[0];
  27     std::vector<bool>::reference r2 = v[3];
  28
  29 #if TEST_STD_VER >= 11
  30     static_assert((noexcept(v.swap(r1,r2))), "");
  31 #endif
  32
  33     assert(!r1);
  34     assert( r2);
  35     v.swap(r1, r2);
  36     assert( r1);
  37     assert(!r2);
  38
  39     return true;
  40 }
  41
  42 int main(int, char**)
  43 {
  44     tests();
  45 #if TEST_STD_VER > 17
  46     static_assert(tests());
  47 #endif
  48     return 0;
  49 }