Commits on Apr 22, 2020

1. Merge rules R.12 and R.13; explain about RAII factories. …

   R.12 and R.13 were both written for a C-style world where the idea was
   to get raw resource pointers and then quickly "give" them to RAII types.
   The modern C++ approach is actually to use RAII types exclusively,
   and never handle raw resource pointers even for an instant. R.13 was
   kind of getting there, in that it knew `make_shared` existed; but we
   can strengthen the rule by just saying "Please, use `make_shared`."
   
   "Raw pointers are like raw meat: don't touch them with your hands."
   
   Also update for C++17: it's no longer true that `shared_ptr<T>(new T())`
   can ever cause a leak due to interleaved evaluations.
   But it's still a nasty habit. Use `make_shared`.

   

   Quuxplusone committed Apr 22, 2020
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