Non-constraint interfaces for all constrainable interfaces

webrtc/api/mediaconstraintsinterface.h

 /*
  *  Copyright 2013 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.
  */
 
 // This file contains the interface for MediaConstraints, corresponding to
 // the definition at
 // http://www.w3.org/TR/mediacapture-streams/#mediastreamconstraints and also
 // used in WebRTC: http://dev.w3.org/2011/webrtc/editor/webrtc.html#constraints.
 
 #ifndef WEBRTC_API_MEDIACONSTRAINTSINTERFACE_H_
 #define WEBRTC_API_MEDIACONSTRAINTSINTERFACE_H_
 
 #include <string>
 #include <vector>
 
+#include "webrtc/base/optional.h"
+
 namespace webrtc {
 
 // MediaConstraintsInterface
 // Interface used for passing arguments about media constraints
 // to the MediaStream and PeerConnection implementation.
 class MediaConstraintsInterface {
  public:
   struct Constraint {
     Constraint() {}
     Constraint(const std::string& key, const std::string value)
@@ skipping 79 matching lines @@
 
  protected:
   // Dtor protected as objects shouldn't be deleted via this interface
   virtual ~MediaConstraintsInterface() {}
 };
 
 bool FindConstraint(const MediaConstraintsInterface* constraints,
                     const std::string& key, bool* value,
                     size_t* mandatory_constraints);
 
+bool FindConstraint(const MediaConstraintsInterface* constraints,
+                    const std::string& key,
+                    int* value,
+                    size_t* mandatory_constraints);
+
+rtc::Optional<bool> ConstraintToOptionalBool(
+    const MediaConstraintsInterface* constraints,
+    const std::string& key);
+rtc::Optional<int> ConstraintToOptionalInt(
+    const MediaConstraintsInterface* constraints,
+    const std::string& key);
+
 }  // namespace webrtc
 
 #endif  // WEBRTC_API_MEDIACONSTRAINTSINTERFACE_H_