Default constructor for file

webrtc/base/file.h

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 12 matching lines @@
 // This class wraps the platform specific APIs for simple file interactions.
 //
 // The various read and write methods are best effort, i.e. if an underlying
 // call does not manage to read/write all the data more calls will be performed,
 // until an error is detected or all data is read/written.
 class File {
  public:
   // Wraps the given PlatformFile. This class is then responsible for closing
   // the file, which will be done in the destructor if Close is never called.
   explicit File(PlatformFile);
+  // The default constructor produces a closed file.
+  File();
   ~File();
 
   File(File&& other);
   File& operator=(File&& other);
 
   // Open and Create give files with both reading and writing enabled.
   static File Open(const std::string& path);
   // If the file already exists it will be overwritten.
   static File Create(const std::string& path);
 
@@ skipping 18 matching lines @@
   bool IsOpen();
 
  private:
   PlatformFile file_;
   RTC_DISALLOW_COPY_AND_ASSIGN(File);
 };
 
 }  // namespace rtc
 
 #endif  // WEBRTC_BASE_FILE_H_