qtypeinfo: Improve container check

Smart pointers like QSharedPointer<T> do have a value_type, but their
equality does not depend on T being comparable. Therefore, instead of
simply checking for T::value_type, test for a few other container
requirements.
This also required to add an additional check for std::optional, as that
one has an unconstrained operator== on MSVC.

Change-Id: Iefd048f7aa360f4713ecd79f80acd7dae72ee18c
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

0 files changed, 0 insertions, 0 deletions