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libcamera: controls: Use std::optional to handle invalid control values

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Previously, ControlList::get<T>() would use default constructed objects to
indicate that a ControlList does not have the requested Control. This has
several disadvantages: 1) It requires types to be default constructible,
2) it does not differentiate between a default constructed object and an
object that happens to have the same state as a default constructed object.

std::optional<T> additionally stores the information if the object is valid
or not, and therefore is more expressive than a default constructed object.

Signed-off-by: Christian Rauch <Rauch.Christian@gmx.de>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Christian Rauch 2022-07-05 10:55:48 +01:00 • committed by Laurent Pinchart
parent ef77e26379
commit 1c4d480185
10 changed files with 44 additions and 44 deletions
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4
src/cam/main.cpp
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@ -301,7 +301,7 @@ std::string CamApp::cameraName(const Camera *camera)
* is only used if the location isn't present or is set to External.
*/
if (props.contains(properties::Location)) {
switch (props.get(properties::Location)) {
switch (*props.get(properties::Location)) {
case properties::CameraLocationFront:
addModel = false;
name = "Internal front camera ";
@ -321,7 +321,7 @@ std::string CamApp::cameraName(const Camera *camera)
* If the camera location is not availble use the camera model
* to build the camera name.
*/
name = "'" + props.get(properties::Model) + "' ";
name = "'" + *props.get(properties::Model) + "' ";
}
name += "(" + camera->id() + ")";