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>

include/libcamera/camera_manager.h

@@ -7,6 +7,7 @@
 #ifndef __LIBCAMERA_CAMERA_MANAGER_H__
 #define __LIBCAMERA_CAMERA_MANAGER_H__
 
+#include <memory>
 #include <string>
 #include <vector>
 
@@ -37,7 +38,7 @@ private:
 	void operator=(const CameraManager &) = delete;
 	~CameraManager();
 
-	DeviceEnumerator *enumerator_;
+	std::unique_ptr<DeviceEnumerator> enumerator_;
 	std::vector<PipelineHandler *> pipes_;
 
 	EventDispatcher *dispatcher_;

src/libcamera/camera_manager.cpp

@@ -73,7 +73,6 @@ CameraManager::~CameraManager()
  */
 int CameraManager::start()
 {
-
 	if (enumerator_)
 		return -ENODEV;
 
@@ -95,7 +94,7 @@ int CameraManager::start()
 		 */
 		while (1) {
 			PipelineHandler *pipe = factory->create();
-			if (!pipe->match(enumerator_)) {
+			if (!pipe->match(enumerator_.get())) {
 				delete pipe;
 				break;
 			}
@@ -130,10 +129,7 @@ void CameraManager::stop()
 
 	pipes_.clear();
 
-	if (enumerator_)
-		delete enumerator_;
-
-	enumerator_ = nullptr;
+	enumerator_.reset(nullptr);
 }
 
 /**

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.

src/libcamera/include/device_enumerator.h

@@ -8,6 +8,7 @@
 #define __LIBCAMERA_DEVICE_ENUMERATOR_H__
 
 #include <map>
+#include <memory>
 #include <string>
 #include <vector>
 
@@ -34,7 +35,7 @@ private:
 class DeviceEnumerator
 {
 public:
-	static DeviceEnumerator *create();
+	static std::unique_ptr<DeviceEnumerator> create();
 
 	virtual ~DeviceEnumerator();