Hello, what C++ version does the POV-Ray community want to target for 
the future? I see POV_CPP11_SUPPORTED that as far as I were able to 
understand is only used to define POVMS_NULLPTR, but older compilers are 
supported too anyway.

Is there any reason to continue to support compilers older than C++11? 
If we could just assume C++11 (or better, C++17) several sections of the 
code could be rewritten to take advantage of new features of the 
anguage. For example, I'd start with using constexpr instead of #define 
in a lot of cases; kinda of a low hanging fruit, but type checking for 
constants is in my opinion worth having in the 2020's.

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