Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

This is an older version of Boost and was released in 2013. The current version is 1.90.0.

io_service::work::io_service

(Deprecated: use get_io_service().) Get the io_service associated with the work.

boost::asio::io_service & io_service();