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

io_context::work::work (2 of 2 overloads)

Copy constructor notifies the io_context that work is starting.

    const work & other);

The constructor is used to inform the io_context that some work has begun. This ensures that the io_context object's run() function will not exit while the work is underway.