[/ / Copyright (c) 2003-2023 Christopher M. Kohlhoff (chris at kohlhoff dot com) / / Distributed under the Boost Software License, Version 1.0. (See accompanying / file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) /] [section:WaitHandler Wait handler requirements] A wait handler must meet the requirements for a [link boost_asio.reference.Handler handler]. A value `h` of a wait handler class should work correctly in the expression `h(ec)`, where `ec` is an lvalue of type `const error_code`. [endsect]