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