libcamera: controls: Add templates to convert a type T to a ControlType

These will be used to implement ControlValue::get() and set() as template functions. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2020-02-14 17:02:18 +02:00
parent 5eaf4fed19
commit 300f6e4434
2 changed files with 29 additions and 1 deletions
@@ -22,6 +22,34 @@ enum ControlType {
 	ControlTypeInteger64,
 };

+namespace details {
+
+template<typename T>
+struct control_type {
+};
+
+template<>
+struct control_type<void> {
+	static constexpr ControlType value = ControlTypeNone;
+};
+
+template<>
+struct control_type<bool> {
+	static constexpr ControlType value = ControlTypeBool;
+};
+
+template<>
+struct control_type<int32_t> {
+	static constexpr ControlType value = ControlTypeInteger32;
+};
+
+template<>
+struct control_type<int64_t> {
+	static constexpr ControlType value = ControlTypeInteger64;
+};
+
+} /* namespace details */
+
 class ControlValue
 {
 public: