libcxx/test/std/iterators/predef.iterators/move.iterators/move.sentinel/base.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 // UNSUPPORTED: c++03, c++11, c++14, c++17
  10
  11 // <iterator>
  12
  13 // move_sentinel
  14
  15 // constexpr S base() const;
  16
  17 #include <cassert>
  18 #include <iterator>
  19 #include <utility>
  20
  21 #include "test_macros.h"
  22
  23 constexpr bool test()
  24 {
  25   // The sentinel type is a value.
  26   {
  27     auto m = std::move_sentinel<int>(42);
  28     const auto& cm = m;
  29     assert(m.base() == 42);
  30     assert(cm.base() == 42);
  31     assert(std::move(m).base() == 42);
  32     assert(std::move(cm).base() == 42);
  33     ASSERT_SAME_TYPE(decltype(m.base()), int);
  34     ASSERT_SAME_TYPE(decltype(cm.base()), int);
  35     ASSERT_SAME_TYPE(decltype(std::move(m).base()), int);
  36     ASSERT_SAME_TYPE(decltype(std::move(cm).base()), int);
  37   }
  38
  39   // The sentinel type is a pointer.
  40   {
  41     int a[] = {1, 2, 3};
  42     auto m = std::move_sentinel<const int*>(a);
  43     const auto& cm = m;
  44     assert(m.base() == a);
  45     assert(cm.base() == a);
  46     assert(std::move(m).base() == a);
  47     assert(std::move(cm).base() == a);
  48     ASSERT_SAME_TYPE(decltype(m.base()), const int*);
  49     ASSERT_SAME_TYPE(decltype(cm.base()), const int*);
  50     ASSERT_SAME_TYPE(decltype(std::move(m).base()), const int*);
  51     ASSERT_SAME_TYPE(decltype(std::move(cm).base()), const int*);
  52   }
  53   return true;
  54 }
  55
  56 int main(int, char**)
  57 {
  58   test();
  59   static_assert(test());
  60
  61   return 0;
  62 }