cam: options: Add empty() function to OptionValue class

Add a convenience helper to check if an option value is empty, based on
the value type. This is useful as a shortcut syntax to check if an
option has been set.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/cam/options.h b/src/cam/options.h
index 210e502a..83c409ae 100644
--- a/src/cam/options.h
+++ b/src/cam/options.h
@@ -135,6 +135,7 @@ public:
 	void addValue(const OptionValue &value);
 
 	ValueType type() const { return type_; }
+	bool empty() const { return type_ == ValueType::ValueNone; }
 
 	operator int() const;
 	operator std::string() const;