[boost] High number of integer_sequence/index_sequence implementations

Subject: [boost] High number of integer_sequence/index_sequence implementations
From: Nikita Kniazev (nok.raven_at_[hidden])
Date: 2019-01-14 16:40:03

Bunch of Boost libraries have their own integer_sequence/index_sequence
implementation. Wouldn’t it be better if there was
boost::integer_sequence/boost::index_sequence?

boost\beast\core\detail\integer_sequence.hpp
boost\callable_traits\detail\polyfills\make_index_sequence.hpp
boost\context\detail\index_sequence.hpp
boost\fusion\support\detail\index_sequence.hpp
boost\mp11\integer_sequence.hpp
boost\phoenix\core\detail\index_sequence.hpp (alias of fusion one)
boost\poly_collection\detail\functional.hpp (uses mp11 one)
boost\test\data\index_sequence.hpp
boost\variant\detail\multivisitors_cpp11_based.hpp