/usr/include/boost/asio/system_timer.hpp is in libboost1.55-dev 1.55.0+dfsg-3.
This file is owned by root:root, with mode 0o644.
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// system_timer.hpp
// ~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2013 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_SYSTEM_TIMER_HPP
#define BOOST_ASIO_SYSTEM_TIMER_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include <boost/asio/detail/config.hpp>
#if defined(BOOST_ASIO_HAS_STD_CHRONO) \
|| defined(BOOST_ASIO_HAS_BOOST_CHRONO) \
|| defined(GENERATING_DOCUMENTATION)
#if defined(BOOST_ASIO_HAS_STD_CHRONO)
# include <chrono>
#elif defined(BOOST_ASIO_HAS_BOOST_CHRONO)
# include <boost/chrono/system_clocks.hpp>
#endif
#include <boost/asio/basic_waitable_timer.hpp>
namespace boost {
namespace asio {
#if defined(GENERATING_DOCUMENTATION)
/// Typedef for a timer based on the system clock.
/**
* This typedef uses the C++11 @c <chrono> standard library facility, if
* available. Otherwise, it may use the Boost.Chrono library. To explicitly
* utilise Boost.Chrono, use the basic_waitable_timer template directly:
* @code
* typedef basic_waitable_timer<boost::chrono::system_clock> timer;
* @endcode
*/
typedef basic_waitable_timer<chrono::system_clock> system_timer;
#elif defined(BOOST_ASIO_HAS_STD_CHRONO)
typedef basic_waitable_timer<std::chrono::system_clock> system_timer;
#elif defined(BOOST_ASIO_HAS_BOOST_CHRONO)
typedef basic_waitable_timer<boost::chrono::system_clock> system_timer;
#endif
} // namespace asio
} // namespace boost
#endif // defined(BOOST_ASIO_HAS_STD_CHRONO)
// || defined(BOOST_ASIO_HAS_BOOST_CHRONO)
// || defined(GENERATING_DOCUMENTATION)
#endif // BOOST_ASIO_SYSTEM_TIMER_HPP
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