I think both make sense. For now:
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CmdStan manual in make instructions
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In the Stan user’s guide (not reference manual) section on map functions
Going forward, I want to add a section to the Stan reference manual on the C++ base class/concept for the generated model class and functions. It’ll make sense to add it there, too, when that exists. For now, the manual avoids going down to code and configuration specifics.
If you missed the manual re-org going by, I split the manual into a reference manual for language and algorithms, a user’s guide with model examples and programming techniques, and a functions guide for the built-in functions. Only the reference manual has html so far, but I’m working on converting the others.