[Development] C++20 comparisons @ Qt (was: Re: C++20 @ Qt)

[Thiago Macieira]

On Thursday, 21 September 2023 02:10:22 PDT Ivan Solovev via Development 
wrote:
> But I'd say that if someone wants to implement three-way comparison for
> their classes in C++17, then a bit better understanding of the language
> features is a reasonable expectation.

Allowing class developers to implement the three-way comparison such that Qt 
can make use of it is fine. That's basically allowing them to use the same 
technique we will be using to make our classes three-way comparable.

Providing an API for three-way comparison in C++17 does not need to happen. 
People can upgrade to C++20 or complain to their vendors. We are talking about 
adding this to a Qt release to happen in 2024, nearly 4 years after the C++ 
edition was published.

I won't oppose it if it is simple, without imposing undue constraints. But it 
need not be part of the initial design.

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Cloud Software Architect - Intel DCAI Cloud Engineering
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