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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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2
src/ipa/raspberrypi/raspberrypi.cpp
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@ -993,7 +993,7 @@ void IPARPi::returnEmbeddedBuffer(unsigned int bufferId)
void IPARPi::prepareISP(const ISPConfig &data)
{
int64_t frameTimestamp = data.controls.get(controls::SensorTimestamp);
int64_t frameTimestamp = data.controls.get(controls::SensorTimestamp).value_or(0);
RPiController::Metadata lastMetadata;
Span<uint8_t> embeddedBuffer;