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, c++20, c++23
10 
11 // <fstream>
12 
13 // class basic_filebuf;
14 
15 // native_handle_type native_handle() const noexcept;
16 
17 #include <cassert>
18 #include <fstream>
19 #include <filesystem>
20 #include <utility>
21 
22 #include "platform_support.h"
23 #include "test_macros.h"
24 #include "../native_handle_test_helpers.h"
25 
26 template <typename CharT>
test()27 void test() {
28   std::basic_filebuf<CharT> f;
29   std::filesystem::path p = get_temp_file_name();
30 
31   // non-const
32   {
33     assert(f.open(p, std::ios_base::in) != nullptr);
34     std::same_as<NativeHandleT> decltype(auto) handle = f.native_handle();
35     assert(is_handle_valid(handle));
36     f.close();
37     assert(!is_handle_valid(handle));
38     static_assert(noexcept(f.native_handle()));
39   }
40   // const
41   {
42     assert(f.open(p, std::ios_base::in) != nullptr);
43     std::same_as<NativeHandleT> decltype(auto) const_handle = std::as_const(f).native_handle();
44     assert(is_handle_valid(const_handle));
45     f.close();
46     assert(!is_handle_valid(const_handle));
47     static_assert(noexcept(std::as_const(f).native_handle()));
48   }
49 }
50 
main(int,char **)51 int main(int, char**) {
52   test<char>();
53 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
54   test<wchar_t>();
55 #endif
56 
57   return 0;
58 }
59