63e88f80
 Hu Chunming
提交三方库
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//
// wait_traits.hpp
// ~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2022 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)
//
#ifndef BOOST_ASIO_WAIT_TRAITS_HPP
#define BOOST_ASIO_WAIT_TRAITS_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include <boost/asio/detail/push_options.hpp>
namespace boost {
namespace asio {
/// Wait traits suitable for use with the basic_waitable_timer class template.
template <typename Clock>
struct wait_traits
{
/// Convert a clock duration into a duration used for waiting.
/**
* @returns @c d.
*/
static typename Clock::duration to_wait_duration(
const typename Clock::duration& d)
{
return d;
}
/// Convert a clock duration into a duration used for waiting.
/**
* @returns @c d.
*/
static typename Clock::duration to_wait_duration(
const typename Clock::time_point& t)
{
typename Clock::time_point now = Clock::now();
if (now + (Clock::duration::max)() < t)
return (Clock::duration::max)();
if (now + (Clock::duration::min)() > t)
return (Clock::duration::min)();
return t - now;
}
};
} // namespace asio
} // namespace boost
#include <boost/asio/detail/pop_options.hpp>
#endif // BOOST_ASIO_WAIT_TRAITS_HPP
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