57 lines
1.3 KiB
C++
57 lines
1.3 KiB
C++
//
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// wait_traits.hpp
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// ~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef ASIO_WAIT_TRAITS_HPP
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#define ASIO_WAIT_TRAITS_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include "asio/detail/push_options.hpp"
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namespace asio {
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/// Wait traits suitable for use with the basic_waitable_timer class template.
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template <typename Clock>
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struct wait_traits
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{
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/// Convert a clock duration into a duration used for waiting.
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/**
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* @returns @c d.
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*/
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static typename Clock::duration to_wait_duration(
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const typename Clock::duration& d)
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{
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return d;
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}
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/// Convert a clock duration into a duration used for waiting.
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/**
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* @returns @c d.
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*/
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static typename Clock::duration to_wait_duration(
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const typename Clock::time_point& t)
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{
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typename Clock::time_point now = Clock::now();
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if (now + (Clock::duration::max)() < t)
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return (Clock::duration::max)();
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if (now + (Clock::duration::min)() > t)
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return (Clock::duration::min)();
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return t - now;
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}
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};
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#endif // ASIO_WAIT_TRAITS_HPP
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