Minor refactoring of support classes for video-device constraints.

content/renderer/media/media_stream_constraints_util.h

 // Copyright 2014 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.
 
 #ifndef CONTENT_RENDERER_MEDIA_MEDIA_STREAM_CONSTRAINTS_UTIL_H_
 #define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_CONSTRAINTS_UTIL_H_
 
 #include <string>
 
 #include "content/common/content_export.h"
@@ skipping 51 matching lines @@
 // constraints.
 bool CONTENT_EXPORT GetConstraintValueAsString(
     const blink::WebMediaConstraints& constraints,
     const blink::StringConstraint blink::WebMediaTrackConstraintSet::*picker,
     std::string* value);
 
 rtc::Optional<bool> ConstraintToOptional(
     const blink::WebMediaConstraints& constraints,
     const blink::BooleanConstraint blink::WebMediaTrackConstraintSet::*picker);
 
+template <typename ConstraintType>
+bool ConstraintHasMax(const ConstraintType& constraint) {
+  return constraint.hasMax() || constraint.hasExact();
+}
+
+template <typename ConstraintType>
+bool ConstraintHasMin(const ConstraintType& constraint) {
+  return constraint.hasMin() || constraint.hasExact();
+}
+
+template <typename ConstraintType>
+auto ConstraintMax(const ConstraintType& constraint)
+    -> decltype(constraint.max()) {
+  DCHECK(ConstraintHasMax(constraint));
+  return constraint.hasExact() ? constraint.exact() : constraint.max();
+}
+
+template <typename ConstraintType>
+auto ConstraintMin(const ConstraintType& constraint)
+    -> decltype(constraint.min()) {
+  DCHECK(ConstraintHasMin(constraint));
+  return constraint.hasExact() ? constraint.exact() : constraint.min();
+}
+
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_CONSTRAINTS_UTIL_H_