QList/QString/QByteArray: no prepend optimized allocation when empty

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Scoped prepend optimized allocation to only work when prepending into
a non-empty container. Otherwise, even appends would be considered
prepends since d.size == 0 when container is empty

This is, of course, not good for prepend cases but we prefer appends
over prepends. My proposal is to figure out what's the best strategy
based on use cases and performance measurements. For now, let's just
make sure appends are not additionally pessimized

Anyhow, this is an implementation detail and should not be considered
behavior change (at least not the one that is user noticeable)

Task-number: QTBUG-84320
Change-Id: Ibed616a2afa9bc24f78252f15a617bf92e2c6ea3
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

bb10

Andrei Golubev 2020-09-04 11:27:44 +02:00

parent 6239246ea8

commit 6f76da5dd0

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

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