libcamera: camera_manager: Turn enumerator into a unique_ptr<>

Convey the fact that the CameraManager class owns the DeviceEnumerator
instance it creates by using std::unique_ptr<> to store the pointer.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

src/libcamera/device_enumerator.cpp

@@ -14,6 +14,7 @@
 #include "device_enumerator.h"
 #include "log.h"
 #include "media_device.h"
+#include "utils.h"
 
 /**
  * \file device_enumerator.h
@@ -128,20 +129,18 @@ bool DeviceMatch::match(const MediaDevice *device) const
  * \return A pointer to the newly created device enumerator on success, or
  * nullptr if an error occurs
  */
-DeviceEnumerator *DeviceEnumerator::create()
+std::unique_ptr<DeviceEnumerator> DeviceEnumerator::create()
 {
-	DeviceEnumerator *enumerator;
+	std::unique_ptr<DeviceEnumerator> enumerator;
 
 	/**
 	 * \todo Add compile time checks to only try udev enumerator if libudev
 	 * is available.
 	 */
-	enumerator = new DeviceEnumeratorUdev();
+	enumerator = utils::make_unique<DeviceEnumeratorUdev>();
 	if (!enumerator->init())
 		return enumerator;
 
-	delete enumerator;
-
 	/*
 	 * Either udev is not available or udev initialization failed. Fall back
 	 * on the sysfs enumerator.