Introduce base::ScopedPlatformHandle

base/files/scoped_platform_handle.cc

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/files/scoped_platform_handle.h"
+
+namespace base {
+
+ScopedPlatformHandle::ScopedPlatformHandle() : ScopedPlatformHandle(nullptr) {}
+
+ScopedPlatformHandle::ScopedPlatformHandle(std::nullptr_t) {}
+
+ScopedPlatformHandle::ScopedPlatformHandle(ScopedPlatformHandle&& other) {
+  *this = std::move(other);
+}
+
+ScopedPlatformHandle::ScopedPlatformHandle(HandleType handle)
+    : handle_(handle) {}
+
+ScopedPlatformHandle::ScopedPlatformHandle(ScopedHandleType handle)
+    : handle_(std::move(handle)) {}
+
+ScopedPlatformHandle::~ScopedPlatformHandle() {}
+
+ScopedPlatformHandle& ScopedPlatformHandle::operator=(
+    ScopedPlatformHandle&& other) {

[dcheng, 2017/02/23 21:45:37]

If you want, this and the move ctor can be = default in the .cc.

+  handle_ = std::move(other.handle_);
+  return *this;
+}
+
+bool ScopedPlatformHandle::is_valid() const {
+#if defined(OS_WIN)

[dcheng, 2017/02/23 21:45:37]

Most of the time we have files like this, we just have
scoped_platform_handle_win.cc, scoped_platform_handle_posix.cc rather than
conditionally compiling each method that's platform specific.

+  return handle_.IsValid();
+#elif defined(OS_POSIX)
+  return handle_.is_valid();
+#endif
+}
+
+void ScopedPlatformHandle::reset() {
+#if defined(OS_WIN)
+  handle_.Close();
+#elif defined(OS_POSIX)
+  handle_.reset();
+#endif
+}
+
+ScopedPlatformHandle::HandleType ScopedPlatformHandle::get() const {
+#if defined(OS_WIN)
+  return handle_.Get();
+#elif defined(OS_POSIX)
+  return handle_.get();
+#endif
+}
+
+ScopedPlatformHandle::HandleType ScopedPlatformHandle::release() {
+#if defined(OS_WIN)
+  return handle_.Take();
+#elif defined(OS_POSIX)
+  return handle_.release();
+#endif
+}
+
+ScopedPlatformHandle::ScopedHandleType ScopedPlatformHandle::Take() {
+  return ScopedHandleType(release());
+}
+
+}  // namespace base