libcxx/test/std/iterators/predef.iterators/default.sentinel/default.sentinel.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 // struct default_sentinel_t;
  12 // inline constexpr default_sentinel_t default_sentinel;
  13
  14 #include <iterator>
  15
  16 #include <concepts>
  17 #include <type_traits>
  18
  19 #include "test_macros.h"
  20
  21 int main(int, char**) {
  22   static_assert(std::is_empty_v<std::default_sentinel_t>);
  23   static_assert(std::semiregular<std::default_sentinel_t>);
  24
  25   static_assert(std::same_as<decltype(std::default_sentinel), const std::default_sentinel_t>);
  26
  27   std::default_sentinel_t s1;
  28   auto s2 = std::default_sentinel_t{};
  29   s2 = s1;
  30
  31   return 0;
  32 }