libcxx/test/std/containers/sequences/vector.bool/reference/operator_bool.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 // operator bool()
  12
  13 #include <cassert>
  14 #include <type_traits>
  15 #include <vector>
  16
  17 #include "test_macros.h"
  18
  19 TEST_CONSTEXPR_CXX20 bool test() {
  20   std::vector<bool> vec;
  21   typedef std::vector<bool>::reference Ref;
  22   static_assert(std::is_convertible<Ref, bool>::value, "");
  23
  24   vec.push_back(true);
  25   vec.push_back(false);
  26   Ref true_ref = vec[0];
  27   Ref false_ref = vec[1];
  28   bool b = true_ref;
  29   assert(b);
  30   assert(true_ref);
  31   assert(!false_ref);
  32
  33   return true;
  34 }
  35
  36 int main(int, char**) {
  37   test();
  38 #if TEST_STD_VER > 17
  39     static_assert(test());
  40 #endif
  41
  42   return 0;
  43 }