[libcxx-commits] [llvm] [libcxx] [flang] [clang] [lld] [libc++][streams] P1759R6: Native handles and file streams (PR #76632)

[Hristo Hristov via libcxx-commits]

================
@@ -0,0 +1,71 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef TEST_STD_INPUT_OUTPUT_FILE_STREAMS_FSTREAMS_TEST_HELPERS_H
+#define TEST_STD_INPUT_OUTPUT_FILE_STREAMS_FSTREAMS_TEST_HELPERS_H
+
+#if _LIBCPP_STD_VER >= 26
+
+#  include <cassert>
+#  include <concepts>
+#  include <cstdio>
+#  include <fstream>
+#  include <filesystem>
+#  include <type_traits>
+#  include <utility>
+
+#  if defined(_LIBCPP_WIN32API)
+#    define WIN32_LEAN_AND_MEAN
+#    define NOMINMAX
+#    include <io.h>
+#    include <windows.h>
+#  else
+#    include <fcntl.h>
+#  endif
+
+#  include "platform_support.h"
+
+#  if defined(_LIBCPP_WIN32API)
+using HandleT = void*; // HANDLE
+
+bool is_handle_valid([[HandleT handle) {
+  if (LPBY_HANDLE_FILE_INFORMATION & pFileInformation; !GetFileInformationByHandle(handle, &lpFileInformation))
+    return false;
+  return true;
+};
----------------
Zingam wrote:

```suggestion
bool is_handle_valid(void* handle) {
    if (BY_HANDLE_FILE_INFORMATION fileInformation; !GetFileInformationByHandle(handle, &fileInformation))
        return false;
    return true;
};
```

https://github.com/llvm/llvm-project/pull/76632