sjjaffe/cpp-useful-iterators @ d2d840be26c3db400a02c58c8b2eb6d28b9d4177

Sam Jaffe 1c7d9584a5 Segregate and shrink names for recursives.		4 lat temu
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arrow_proxy.h	4165d56213 Add a C++17 version of iterator_facade using type deduction.	4 lat temu
traits.h	013f9c4155 Alter recursive iterator w.r.t. new facade code.	4 lat temu