[Development] qsizetype and classes working with QStrings or QList
Matthew Woehlke
mwoehlke.floss at gmail.com
Tue Aug 25 19:48:12 CEST 2020
On 25/08/2020 02.22, Mathias Hasselmann wrote:
> I'd really enjoy implementing list models without having
> to litter static casts all over the place. Well, but seems that chance
> got missed once again with qsizetype still being signed.
That's intentional. There are problems with unsigned index types, not
least of which is they aren't practically useful anyway. Some consider
it a mistake that size_t is unsigned, and indeed, ssize_t is starting to
be retrofitted in some places (e.g. `container.ssize()`). If we ever get
an STL2 it will likely also have signed index types.
Signed index types allow things like indexing-from-end and make tests
for invalid indices far less painful. Seriously, which of these do you
prefer?
if (s.find(ch) < 0) // option 1
if (s.find(ch) != std::string::npos) // option 2
--
Matthew
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