Boost website changes and .'cxxstd'

From: Edward Diener (eldiener_at_[hidden])
Date: 2020-12-24 00:39:05

Even though I have worked a little with PHP in the past I do not have 
the talent to make the change to the website which would incorporate the 
addition of the meta information json field 'cxxstd' to the Boost 
documentation web page for each library. The idea is that if 'cxxstd' is 
set to a value the documentation for that library would also show:

C++ standard minimum level: C++nn

where nn would be 11, 14, 17, or 20 depending on the value of 'cxxstd'. 
Alternatively if there is no 'cxxstd' entry for a library or if the 
value of 'cxxstd' is '03', we could either specify 'nn' as '03' or leave 
off the line stating the 'C++ standard minimum level completely.

On the face of it this should be doable in the website code but 
evidently Daniel James is the only one who really understands how this 
works in the code and he is no longer active in Boost. So if someone 
else who understands the website code and PHP could do this it would be 
appreciated, since I think it will be valuable telling end-users whether 
a Boost library is usable at the C++ compiler level they are using.