63e88f80
 Hu Chunming
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/*
* Copyright Andrey Semashev 2007 - 2015.
* 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)
*/
/*!
* \file timestamp.hpp
* \author Andrey Semashev
* \date 31.07.2011
*
* \brief This header is the Boost.Log library implementation, see the library documentation
* at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html.
*/
#ifndef BOOST_LOG_DETAIL_TIMESTAMP_HPP_INCLUDED_
#define BOOST_LOG_DETAIL_TIMESTAMP_HPP_INCLUDED_
#include <boost/cstdint.hpp>
#include <boost/log/detail/config.hpp>
#if defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
#include <boost/winapi/basic_types.hpp>
#endif
#include <boost/log/detail/header.hpp>
#ifdef BOOST_HAS_PRAGMA_ONCE
#pragma once
#endif
namespace boost {
BOOST_LOG_OPEN_NAMESPACE
namespace aux {
/*!
* Duration between two timestamps
*/
class duration
{
int64_t m_ticks;
public:
explicit duration(int64_t ticks = 0) BOOST_NOEXCEPT : m_ticks(ticks) {}
#if defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
int64_t milliseconds() const { return m_ticks; }
#else
BOOST_LOG_API int64_t milliseconds() const;
#endif
};
/*!
* Opaque timestamp class
*/
class timestamp
{
uint64_t m_ticks;
public:
explicit timestamp(uint64_t ticks = 0) BOOST_NOEXCEPT : m_ticks(ticks) {}
duration operator- (timestamp that) const
{
return duration(m_ticks - that.m_ticks);
}
};
/*!
* \fn get_timestamp
*
* The function returns a timestamp, in opaque units since an unspecified
* time point. This timer is guaranteed to be monotonic, it should not
* be affected by clock changes, either manual or seasonal. Also, it
* should be as fast as possible.
*/
#if defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
typedef uint64_t (BOOST_WINAPI_WINAPI_CC* get_tick_count_t)();
extern BOOST_LOG_API get_tick_count_t get_tick_count;
inline timestamp get_timestamp()
{
return timestamp(get_tick_count());
}
#else
typedef timestamp (*get_timestamp_t)();
extern BOOST_LOG_API get_timestamp_t get_timestamp;
#endif
} // namespace aux
BOOST_LOG_CLOSE_NAMESPACE // namespace log
} // namespace boost
#include <boost/log/detail/footer.hpp>
#endif // BOOST_LOG_DETAIL_TIMESTAMP_HPP_INCLUDED_
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