boost/atomic/posix_clock_traits_fwd.hpp
/* * 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) * * Copyright (c) 2025 Andrey Semashev */ /*! * \file atomic/posix_clock_traits_fwd.hpp * * This header contains declaration of the \c posix_clock_traits class template. */ #ifndef BOOST_ATOMIC_POSIX_CLOCK_TRAITS_FWD_HPP_INCLUDED_ #define BOOST_ATOMIC_POSIX_CLOCK_TRAITS_FWD_HPP_INCLUDED_ #include <boost/atomic/detail/config.hpp> #include <boost/atomic/detail/header.hpp> #ifdef BOOST_HAS_PRAGMA_ONCE #pragma once #endif namespace boost { namespace atomics { /*! * \brief The structure contains traits for compatibility between chrono clocks and POSIX clocks. * * This class template is meant to be specialized for clock types that are compatible with `std::chrono` * requirements and are based on one of the POSIX clocks identified by * a [`clockid_t`](https://man7.org/linux/man-pages/man3/clockid_t.3type.html) constant. * * Every specialization of this class must support the following interface: * * ``` * // POSIX clock identifier * static constexpr clockid_t clock_id = ...; * * // Function that converts a time point to a timespec structure * static timespec to_timespec(Clock::time_point time_point) noexcept; * ``` * * Note that the `timespec` structure returned from `to_timespec` must use the identified POSIX * clock epoch and time units. There are no invalid input `time_point` values, so `to_timespec` * must never fail with an exception. * * The second template parameter of this class template may be used by partial specializations * to leverage SFINAE to selectively enable it for a set of clock types. */ template< typename Clock, typename = void > struct posix_clock_traits; } // namespace atomics } // namespace boost #include <boost/atomic/detail/footer.hpp> #endif // BOOST_ATOMIC_POSIX_CLOCK_TRAITS_FWD_HPP_INCLUDED_