[libcamera-devel] [PATCH v2 2/6] libcamera: class: Provide move and copy disablers

[Kieran Bingham]

It can be difficult to correctly parse the syntax for copy/move and the
associated assignment operators.

Provide helpers as syntactic sugar to facilitate disabling either the
copy constructor, and copy assignment operator, and the move constructor
and move assignment operator in a way which is explicit and clear.

Signed-off-by: Kieran Bingham <kieran.bingham at ideasonboard.com>
---
 include/libcamera/class.h | 12 ++++++++++++
 src/libcamera/class.cpp   | 18 ++++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/include/libcamera/class.h b/include/libcamera/class.h
index 2d9b7ebfdb08..5cd31d1b9f37 100644
--- a/include/libcamera/class.h
+++ b/include/libcamera/class.h
@@ -11,6 +11,18 @@
 
 namespace libcamera {
 
+#define LIBCAMERA_DISABLE_COPY(klass)  \
+	klass(const klass &) = delete; \
+	klass &operator=(const klass &) = delete
+
+#define LIBCAMERA_DISABLE_MOVE(klass) \
+	klass(klass &&) = delete;     \
+	klass &operator=(klass &&) = delete
+
+#define LIBCAMERA_DISABLE_COPY_AND_MOVE(klass) \
+	LIBCAMERA_DISABLE_COPY(klass);         \
+	LIBCAMERA_DISABLE_MOVE(klass)
+
 #ifndef __DOXYGEN__
 #define LIBCAMERA_DECLARE_PRIVATE(klass)				\
 public:									\
diff --git a/src/libcamera/class.cpp b/src/libcamera/class.cpp
index 8a608edb369b..b081d05ec3ac 100644
--- a/src/libcamera/class.cpp
+++ b/src/libcamera/class.cpp
@@ -17,6 +17,24 @@
 
 namespace libcamera {
 
+/**
+ * \def LIBCAMERA_DISABLE_COPY
+ * \brief Delete the copy constructor and assignment operator.
+ * \param klass The identifier of the class to modify
+ */
+
+/**
+ * \def LIBCAMERA_DISABLE_MOVE
+ * \brief Delete the move construtor and assignment operator.
+ * \param klass The identifier of the class to modify
+ */
+
+/**
+ * \def LIBCAMERA_DISABLE_COPY_AND_MOVE
+ * \brief Delete all copy and move constructors, and assignment operators.
+ * \param klass The identifier of the class to modify
+ */
+
 /**
  * \def LIBCAMERA_DECLARE_PRIVATE
  * \brief Declare private data for a public class
-- 
2.25.1