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 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 clock.hpp
* \author Andrey Semashev
* \date 01.12.2007
*
* The header contains wall clock attribute implementation and typedefs.
*/
#ifndef BOOST_LOG_ATTRIBUTES_CLOCK_HPP_INCLUDED_
#define BOOST_LOG_ATTRIBUTES_CLOCK_HPP_INCLUDED_
#include <boost/log/detail/config.hpp>
#include <boost/log/attributes/attribute.hpp>
#include <boost/log/attributes/attribute_value.hpp>
#include <boost/log/attributes/attribute_cast.hpp>
#include <boost/log/attributes/attribute_value_impl.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 current date and time
*
* The attribute generates current time stamp as a value. The type of the attribute value
* is determined with time traits passed to the class template as a template parameter.
* The time traits provided by the library use \c boost::posix_time::ptime as the time type.
*
* Time traits also determine the way time is acquired. There are two types of time traits
* provided by the library: \c utc_time_traits and \c local_time_traits. The first returns UTC time,
* the second returns local time.
*/
template< typename TimeTraitsT >
class basic_clock :
public attribute
{
public:
//! Generated value type
typedef typename TimeTraitsT::time_type value_type;
protected:
//! Attribute factory implementation
struct BOOST_SYMBOL_VISIBLE impl :
public attribute::impl
{
attribute_value get_value()
{
typedef attribute_value_impl< value_type > result_value;
return attribute_value(new result_value(TimeTraitsT::get_clock()));
}
};
public:
/*!
* Default constructor
*/
basic_clock() : attribute(new impl())
{
}
/*!
* Constructor for casting support
*/
explicit basic_clock(cast_source const& source) : attribute(source.as< impl >())
{
}
};
//! Attribute that returns current UTC time
typedef basic_clock< utc_time_traits > utc_clock;
//! Attribute that returns current local time
typedef basic_clock< local_time_traits > local_clock;
} // namespace attributes
BOOST_LOG_CLOSE_NAMESPACE // namespace log
} // namespace boost
#include <boost/log/detail/footer.hpp>
#endif // BOOST_LOG_ATTRIBUTES_CLOCK_HPP_INCLUDED_
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