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core: add CRTP base class to unit types

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The goal here is to add general addition and scalar multiplication
functions to the unit types.

Thereto, we need a CRTP
(https://en.wikipedia.org/wiki/Curiously_recurring_template_pattern)
base class.

However, this breaks compound initialization, so we have to use
named initializers:
	weight_t { 2000 } -> weight_t { .grams = 2000 }
The good thing is that this is exactly how these classes were
supposed to be used: make the unit explicit!

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2024-09-01 21:48:31 +02:00 • committed by bstoeger
parent 696ba61eef
commit 12ca172a9e
26 changed files with 127 additions and 138 deletions
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4
core/imagedownloader.cpp
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@ -217,7 +217,7 @@ Thumbnailer::Thumbnail Thumbnailer::getVideoThumbnailFromStream(QDataStream &str
// is not repeated ad-nauseum for broken images.
if (numPics == 0 && prefs.extract_video_thumbnails) {
QMetaObject::invokeMethod(VideoFrameExtractor::instance(), "extract", Qt::AutoConnection,
Q_ARG(QString, filename), Q_ARG(QString, filename), Q_ARG(duration_t, duration_t{(int32_t)duration}));
Q_ARG(QString, filename), Q_ARG(QString, filename), Q_ARG(duration_t, duration_t{ .seconds = (int32_t)duration}));
}
// Currently, we support only one picture
@ -231,7 +231,7 @@ Thumbnailer::Thumbnail Thumbnailer::getVideoThumbnailFromStream(QDataStream &str
res = videoImage; // No picture -> show dummy-icon
else
markVideoThumbnail(res); // We got an image -> place our video marker on top of it
return { res, MEDIATYPE_VIDEO, { (int32_t)duration } };
return { res, MEDIATYPE_VIDEO, { .seconds = (int32_t)duration } };
}
// Fetch a thumbnail from cache.