pipeline: raspberrypi: delayed_controls: Template the ControlRingBuffer class

Convert ControlRingBuffer to a templated class to allow arbitrary ring buffer
array types to be defined. Rename ControlRingBuffer to RingBuffer to indicate
this.

Signed-off-by: Naushir Patuck <[email protected]>
Reviewed-by: David Plowman <[email protected]>
Signed-off-by: Laurent Pinchart <[email protected]>

Author: naushir

src/libcamera/pipeline/raspberrypi/delayed_controls.h

@@ -56,17 +56,18 @@ class DelayedControls
 	};
 
 	static constexpr int listSize = 16;
-	class ControlRingBuffer : public std::array<Info, listSize>
+	template<typename T>
+	class RingBuffer : public std::array<T, listSize>
 	{
 	public:
-		Info &operator[](unsigned int index)
+		T &operator[](unsigned int index)
 		{
-			return std::array<Info, listSize>::operator[](index % listSize);
+			return std::array<T, listSize>::operator[](index % listSize);
 		}
 
-		const Info &operator[](unsigned int index) const
+		const T &operator[](unsigned int index) const
 		{
-			return std::array<Info, listSize>::operator[](index % listSize);
+			return std::array<T, listSize>::operator[](index % listSize);
 		}
 	};
 
@@ -76,7 +77,7 @@ class DelayedControls
 
 	uint32_t queueCount_;
 	uint32_t writeCount_;
-	std::unordered_map<const ControlId *, ControlRingBuffer> values_;
+	std::unordered_map<const ControlId *, RingBuffer<Info>> values_;
 };
 
 } /* namespace RPi */