libcamera: Declare empty virtual destructors as defaulted

The base class of polymorphic classes is required to declare a
destructor. Several of these are empty, and can thus be declared as
defaulted.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Umang Jain <email@uajain.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

include/libcamera/internal/control_validator.h

@@ -16,7 +16,7 @@ class ControlId;
 class ControlValidator
 {
 public:
-	virtual ~ControlValidator() {}
+	virtual ~ControlValidator() = default;
 
 	virtual const std::string &name() const = 0;
 	virtual bool validate(unsigned int id) const = 0;

include/libcamera/internal/ipa_proxy.h

@@ -42,7 +42,7 @@ class IPAProxyFactory
 {
 public:
 	IPAProxyFactory(const char *name);
-	virtual ~IPAProxyFactory() {}
+	virtual ~IPAProxyFactory() = default;
 
 	virtual std::unique_ptr<IPAProxy> create(IPAModule *ipam) = 0;
 

include/libcamera/internal/media_object.h

@@ -31,7 +31,7 @@ protected:
 		: dev_(dev), id_(id)
 	{
 	}
-	virtual ~MediaObject() {}
+	virtual ~MediaObject() = default;
 
 	MediaDevice *dev_;
 	unsigned int id_;

include/libcamera/internal/pipeline_handler.h

@@ -40,7 +40,7 @@ public:
 		: pipe_(pipe)
 	{
 	}
-	virtual ~CameraData() {}
+	virtual ~CameraData() = default;
 
 	Camera *camera_;
 	PipelineHandler *pipe_;
@@ -118,7 +118,7 @@ class PipelineHandlerFactory
 {
 public:
 	PipelineHandlerFactory(const char *name);
-	virtual ~PipelineHandlerFactory() {}
+	virtual ~PipelineHandlerFactory() = default;
 
 	std::shared_ptr<PipelineHandler> create(CameraManager *manager);