[/ / Copyright (c) 2003-2025 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:Disposition Disposition] A type `X` satisfies the `disposition` concept if it is nothrow default-constructible, nothrow move-constructible, nothrow move-assignable, as well as satisfying the additional requirements listed below. In the following table `x` denotes a glvalue of type `X`. [table Disposition requirements [[expression] [return type] [assertion/note[br]pre/post-conditions]] [ [`asio::disposition_traits::not_an_error(x)`] [`bool`] [] ] [ [`asio::disposition_traits::throw_exception(x)`] [] [pre: `asio::disposition_traits::not_an_error(x)` is `false.`\n This function call must exit via an exception.] ] [ [`asio::disposition_traits::to_exception_ptr(x)`] [`std::exception_ptr`] [] ] ] [endsect]