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The following code can produce a warning:

QList<Bar> entries;

std::vector<Foo> values;

values.reserve(entries.size()); // warning

You can silence the warning with:

QList<Bar> entries;

std::vector<Foo> values;

values.reserve(static_cast<std::size_t>(entries.size())); // no warning but very verbose

Adding usize() to Qt Container would improve the readability of the code:

QList<Bar> entries;

std::vector<Foo> values;

values.reserve(entries.usize()); // warning

For Gerrit Dashboard: QTBUG-112183
#	Subject	Branch	Project	Status	CR	V
468756,3	tst_containerapisymmetry: check that std::size() works	dev	qt/qtbase	Status: MERGED	+2	0
483848,1	tst_containerapisymmetry: check that std::size() works	6.6	qt/qtbase	Status: ABANDONED	0	0
483849,1	tst_containerapisymmetry: check that std::size() works	6.5	qt/qtbase	Status: ABANDONED	0	0
483858,1	tst_containerapisymmetry: check that std::size() works	6.5	qt/qtbase	Status: ABANDONED	0	0
483859,1	tst_containerapisymmetry: check that std::size() works	6.6	qt/qtbase	Status: ABANDONED	0	0
483867,1	tst_containerapisymmetry: check that std::size() works	6.5	qt/qtbase	Status: ABANDONED	0	0
483869,1	tst_containerapisymmetry: check that std::size() works	6.6	qt/qtbase	Status: ABANDONED	0	0
483877,1	tst_containerapisymmetry: check that std::size() works	6.5	qt/qtbase	Status: ABANDONED	0	0
483879,1	tst_containerapisymmetry: check that std::size() works	6.6	qt/qtbase	Status: ABANDONED	0	0
573736,3	tst_containerapisymmetry: check that std::size() works	tqtc/lts-6.5	qt/tqtc-qtbase	Status: MERGED	+2	0