[Development] QVariant comparison in Qt6

[Lars Knoll]

> On 18 Sep 2020, at 17:11, Thiago Macieira <thiago.macieira at intel.com> wrote:
> 
> On Friday, 18 September 2020 06:48:50 PDT Lars Knoll wrote:
>> std::optional<int> QVariant::compare(const QVariant &other);
>> 
>> Would that be good enough?
> 
> Why the optional?

Because there is no valid comparison we could do between a QDate and a QPoint. And because a QPolygon doesn’t provide any ordering even when comparing two of them.

Cheers,
Lars

> 
> We should use one of the types from <compare>[1]. Yes, it's C++20; we can make 
> our internal API return an integer that is convertible to those types in the 
> front-end API, under #if __has_include(<compare>).
> 
> [1] https://en.cppreference.com/w/cpp/header/compare
> 
> -- 
> Thiago Macieira - thiago.macieira (AT) intel.com
>  Software Architect - Intel DPG Cloud Engineering
> 
> 
> 
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