libcamera: controls: Allow passing an std::initializer list to set()

For array controls, the ControlList::set() function takes a value as a
type convertible to Span<T>. This allows passing an std::array or an
std::vector in addition to an explicit Span, but doesn't accept an
std::initializer list as Span has no constructor that takes an
initializer list. Callers are thus forced to create temporary objects
explicitly, which isn't nice.

Fix the issue by providing a ControlList::set() function that takes an
std::initializer_list, and convert it to a Span internally.

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

src/libcamera/controls.cpp

@@ -802,6 +802,12 @@ bool ControlList::contains(unsigned int id) const
  * object that the list refers to.
  */
 
+/**
+ * \fn template<typename T, typename V> \
+ * void ControlList::set(const Control<T> &ctrl, const std::initializer_list<V> &value)
+ * \copydoc ControlList::set(const Control<T> &ctrl, const V &value)
+ */
+
 /**
  * \brief Get the value of control \a id
  * \param[in] id The control numerical ID