Fix problems related to using-based function references (C++ 20)

[josephbirkner]

The previous way in which using was used to declare the typeInfo function for each builtin reflectable does not seem to be understood by MSVC 2019 (19.29.30146.0).

This is just the start of the error messages I was seeing during compilation for each usage of a typeInfo function:

[1/442] Building CXX object libs\livesource\CMakeFiles\livesource.dir\ndsliveapi_for_datalayers.zserio-gen\nds\adas\v2022_04\properties\Properties.cpp.obj
D:\code\mapget-datasource-live\cmake-build-release\_deps\zseriocppruntime-src\compiler\extensions\cpp\runtime\src\zserio/Reflectable.h(283): error C2064: term does not evaluate to a function taking 0 arguments
D:\code\mapget-datasource-live\cmake-build-release\_deps\zseriocppruntime-src\compiler\extensions\cpp\runtime\src\zserio/Reflectable.h(283): note: 'typeInfo': function declaration must be available as none of the arguments depend on a template parameter
D:\code\mapget-datasource-live\cmake-build-release\_deps\zseriocppruntime-src\compiler\extensions\cpp\runtime\src\zserio/Reflectable.h(300): note: see reference to class template instantiation 'zserio::BoolReflectable<ALLOC>' being compiled
...

UPDATE: This problem appears only when compiling with C++ 20 standard enabled.

[mikir]

This PR will be solved within scope of issue #544.

[josephbirkner]

Ok, then we can close this for now. I hope that the problem is really MSVC 2019, lets see.

[josephbirkner]

Update: The issue appears only when compiling with C++ 20 standard enabled.

[Mi-La]

Hopefully fixed on master by commit 0e53b4d

[josephbirkner]

Thanks! Do you generally not accept PRs? Then it would be good to mention that somewhere.

[Mi-La]

I was already working on it when you pushed your changes today.
In general we would probably accept a PR, but it's often easier just to get inspired by it :-).

We have also a plan to provide some PR rules/howto, since we are quite paranoid about coding style (which is also not officially defined :-)).