libcxx/test/std/ranges/range.factories/range.istream.view/end.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: no-localization
  10 // UNSUPPORTED: c++03, c++11, c++14, c++17
  11
  12 // constexpr default_sentinel_t end() const noexcept;
  13
  14 #include <cassert>
  15 #include <ranges>
  16 #include <sstream>
  17
  18 #include "test_macros.h"
  19 #include "utils.h"
  20
  21 template <class T>
  22 concept NoexceptEnd =
  23     requires(T t) {
  24       { t.end() } noexcept;
  25     };
  26
  27 static_assert(NoexceptEnd<std::ranges::istream_view<int>>);
  28 static_assert(NoexceptEnd<const std::ranges::istream_view<int>>);
  29
  30 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  31 static_assert(NoexceptEnd<std::ranges::wistream_view<int>>);
  32 static_assert(NoexceptEnd<const std::ranges::wistream_view<int>>);
  33 #endif
  34
  35 template <class CharT>
  36 void test() {
  37   auto iss = make_string_stream<CharT>("12");
  38   std::ranges::basic_istream_view<int, CharT> isv{iss};
  39   [[maybe_unused]] std::same_as<std::default_sentinel_t> auto sent = isv.end();
  40 }
  41
  42 int main(int, char**) {
  43   test<char>();
  44 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  45   test<wchar_t>();
  46 #endif
  47
  48   return 0;
  49 }