libcamera: MappedBuffer: Disable copy and assignment

MappedBuffers have a custom move constructor and assignment operator to
ensure that memory is not unmapped during object manipulation.

Because of the user-defined move constructor, the implicitly-declared
copy-constructor will already be deleted, however delete it explicitly
to help readability of the code, and make it clear that the object can
not be copied.

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

include/libcamera/internal/buffer.h

@@ -10,6 +10,7 @@
 #include <sys/mman.h>
 #include <vector>
 
+#include <libcamera/class.h>
 #include <libcamera/buffer.h>
 #include <libcamera/span.h>
 
@@ -34,6 +35,9 @@ protected:
 
 	int error_;
 	std::vector<Plane> maps_;
+
+private:
+	LIBCAMERA_DISABLE_COPY(MappedBuffer)
 };
 
 class MappedFrameBuffer : public MappedBuffer