libcxx/test/std/input.output/filesystems/fs.filesystem.synopsis/enable_borrowed_range.compile.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 // UNSUPPORTED: no-filesystem
  11 // UNSUPPORTED: availability-filesystem-missing
  12
  13 // <filesystem>
  14
  15 // template <>
  16 // inline constexpr bool ranges::enable_borrowed_range<filesystem::directory_iterator> = true;
  17 // template <>
  18 // inline constexpr bool ranges::enable_borrowed_range<filesystem::recursive_directory_iterator> = true;
  19
  20 #include <filesystem>
  21 #include <ranges>
  22
  23 template<class Range>
  24 void test() {
  25   static_assert(std::ranges::enable_borrowed_range<Range>);
  26   static_assert(!std::ranges::enable_borrowed_range<Range&>);
  27   static_assert(!std::ranges::enable_borrowed_range<const Range>);
  28 }
  29
  30 void test() {
  31   test<std::filesystem::directory_iterator>();
  32   test<std::filesystem::recursive_directory_iterator>();
  33 }