84 lines
2.5 KiB
C++
84 lines
2.5 KiB
C++
/*
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* Copyright Andrey Semashev 2007 - 2015.
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*/
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/*!
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* \file timer.hpp
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* \author Andrey Semashev
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* \date 02.12.2007
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*
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* The header contains implementation of a stop watch attribute.
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*/
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#ifndef BOOST_LOG_ATTRIBUTES_TIMER_HPP_INCLUDED_
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#define BOOST_LOG_ATTRIBUTES_TIMER_HPP_INCLUDED_
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#include <boost/log/detail/config.hpp>
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#include <boost/log/attributes/attribute.hpp>
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#include <boost/log/attributes/attribute_cast.hpp>
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#include <boost/log/attributes/time_traits.hpp>
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#include <boost/log/detail/header.hpp>
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#ifdef BOOST_HAS_PRAGMA_ONCE
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#pragma once
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#endif
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namespace boost {
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BOOST_LOG_OPEN_NAMESPACE
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namespace attributes {
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/*!
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* \brief A class of an attribute that makes an attribute value of the time interval since construction
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*
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* The timer attribute calculates the time passed since its construction and returns it on value acquisition.
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* The attribute value type is <tt>boost::posix_time::time_duration</tt>.
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*
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* On Windows platform there are two implementations of the attribute. The default one is more precise but
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* a bit slower. This version uses <tt>QueryPerformanceFrequence</tt>/<tt>QueryPerformanceCounter</tt> API
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* to calculate elapsed time.
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*
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* There are known problems with these functions when used with some CPUs, notably AMD Athlon with
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* Cool'n'Quiet technology enabled. See the following links for more information and possible resolutions:
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*
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* http://support.microsoft.com/?scid=kb;en-us;895980
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* http://support.microsoft.com/?id=896256
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*
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* In case if none of these solutions apply, you are free to define <tt>BOOST_LOG_NO_QUERY_PERFORMANCE_COUNTER</tt> macro to
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* fall back to another implementation based on Boost.DateTime.
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*/
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class BOOST_LOG_API timer :
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public attribute
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{
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public:
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//! Attribute value type
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typedef utc_time_traits::time_type::time_duration_type value_type;
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private:
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//! Factory implementation
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class BOOST_SYMBOL_VISIBLE impl;
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public:
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/*!
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* Constructor. Starts time counting.
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*/
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timer();
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/*!
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* Constructor for casting support
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*/
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explicit timer(cast_source const& source);
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};
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} // namespace attributes
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BOOST_LOG_CLOSE_NAMESPACE // namespace log
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} // namespace boost
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#include <boost/log/detail/footer.hpp>
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#endif // BOOST_LOG_ATTRIBUTES_TIMER_HPP_INCLUDED_
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