Refactoring: Declare cricket::Codec constructors protected.

webrtc/media/base/codec.h

 /*
  *  Copyright (c) 2004 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 49 matching lines @@
   std::vector<FeedbackParam> params_;
 };
 
 struct Codec {
   int id;
   std::string name;
   int clockrate;
   CodecParameterMap params;
   FeedbackParams feedback_params;
 
-  // Creates a codec with the given parameters.
-  Codec(int id, const std::string& name, int clockrate);
-  // Creates an empty codec.
-  Codec();
-  Codec(const Codec& c);
-  Codec(Codec&& c);
   virtual ~Codec();
 
   // Indicates if this codec is compatible with the specified codec.
   bool Matches(const Codec& codec) const;
 
   // Find the parameter for |name| and write the value to |out|.
   bool GetParam(const std::string& name, std::string* out) const;
   bool GetParam(const std::string& name, int* out) const;
 
   void SetParam(const std::string& name, const std::string& value);
@@ skipping 13 matching lines @@
   virtual webrtc::RtpCodecParameters ToCodecParameters() const;
 
   Codec& operator=(const Codec& c);
   Codec& operator=(Codec&& c);
 
   bool operator==(const Codec& c) const;
 
   bool operator!=(const Codec& c) const {
     return !(*this == c);
   }
+
+ protected:
+  // A Codec can't be created without a subclass.
+  // Creates a codec with the given parameters.
+  Codec(int id, const std::string& name, int clockrate);
+  // Creates an empty codec.
+  Codec();
+  Codec(const Codec& c);
+  Codec(Codec&& c);
 };
 
 struct AudioCodec : public Codec {
   int bitrate;
   size_t channels;
 
   // Creates a codec with the given parameters.
   AudioCodec(int id,
              const std::string& name,
              int clockrate,
@@ skipping 98 matching lines @@
 bool HasTransportCc(const Codec& codec);
 // Returns the first codec in |supported_codecs| that matches |codec|, or
 // nullptr if no codec matches.
 const VideoCodec* FindMatchingCodec(
     const std::vector<VideoCodec>& supported_codecs,
     const VideoCodec& codec);
 
 }  // namespace cricket
 
 #endif  // WEBRTC_MEDIA_BASE_CODEC_H_