The relational operators were removed in
8652c79df0 with the argument that they
do not have a total order. Back than it was a valid argument, because Qt
did not support any of the C++20 ordering types.
Now Qt has its own implementation for all three ordering types, so we
could technically add relational operators and claim that QVariant
provides partial ordering.
However, that could potentially lead to many bugs and/or unexpected
results, if people start using QVariant as a key in std::map/QMap
containers.
We do not want that to happen, so we only use the helper macros to
implement (in)equality operators.
This commit also extends the unit tests, providing more extensive
testing of (in)equality operators and the pre-existing
QVariant::compare() method.
Fixes: QTBUG-113234
Change-Id: I783f3b5df552da782627f4ed0a5bb1b577753a23
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
285a2a75b4