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//
// detail/chrono_time_traits.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2012 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_DETAIL_CHRONO_TIME_TRAITS_HPP
#define BOOST_ASIO_DETAIL_CHRONO_TIME_TRAITS_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include <boost/cstdint.hpp>
#include <boost/asio/detail/push_options.hpp>
namespace boost {
namespace asio {
namespace detail {
// Adapts std::chrono clocks for use with a deadline timer.
template <typename Clock, typename WaitTraits>
struct chrono_time_traits
{
// The clock type.
typedef Clock clock_type;
// The duration type of the clock.
typedef typename clock_type::duration duration_type;
// The time point type of the clock.
typedef typename clock_type::time_point time_type;
// The period of the clock.
typedef typename duration_type::period period_type;
// Get the current time.
static time_type now()
{
return clock_type::now();
}
// Add a duration to a time.
static time_type add(const time_type& t, const duration_type& d)
{
return t + d;
}
// Subtract one time from another.
static duration_type subtract(const time_type& t1, const time_type& t2)
{
return t1 - t2;
}
// Test whether one time is less than another.
static bool less_than(const time_type& t1, const time_type& t2)
{
return t1 < t2;
}
// Implement just enough of the posix_time::time_duration interface to supply
// what the timer_queue requires.
class posix_time_duration
{
public:
explicit posix_time_duration(const duration_type& d)
: d_(d)
{
}
boost::int64_t ticks() const
{
return d_.count();
}
boost::int64_t total_seconds() const
{
return duration_cast<1, 1>();
}
boost::int64_t total_milliseconds() const
{
return duration_cast<1, 1000>();
}
boost::int64_t total_microseconds() const
{
return duration_cast<1, 1000000>();
}
private:
template <boost::int64_t Num, boost::int64_t Den>
boost::int64_t duration_cast() const
{
const boost::int64_t num = period_type::num * Den;
const boost::int64_t den = period_type::den * Num;
if (num == 1 && den == 1)
return ticks();
else if (num != 1 && den == 1)
return ticks() * num;
else if (num == 1 && period_type::den != 1)
return ticks() / den;
else
return ticks() * num / den;
}
duration_type d_;
};
// Convert to POSIX duration type.
static posix_time_duration to_posix_duration(const duration_type& d)
{
return posix_time_duration(WaitTraits::to_wait_duration(d));
}
};
} // namespace detail
} // namespace asio
} // namespace boost
#include <boost/asio/detail/pop_options.hpp>
#endif // BOOST_ASIO_DETAIL_CHRONO_TIME_TRAITS_HPP
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