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 2014. The current version is 1.89.0.

windows::object_handle_service::is_open

windows::object_handle_service::is_open

Determine whether the handle is open.

bool is_open(
    const implementation_type & impl) const;