110 lines
2.8 KiB
C++
110 lines
2.8 KiB
C++
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/*
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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 current_thread_id.hpp
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* \author Andrey Semashev
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* \date 12.09.2009
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*
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* The header contains implementation of a current thread id attribute
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*/
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#ifndef BOOST_LOG_ATTRIBUTES_CURRENT_THREAD_ID_HPP_INCLUDED_
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#define BOOST_LOG_ATTRIBUTES_CURRENT_THREAD_ID_HPP_INCLUDED_
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#include <boost/log/detail/config.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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#if defined(BOOST_LOG_NO_THREADS)
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#error Boost.Log: The current_thread_id attribute is only available in multithreaded builds
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#endif
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#include <boost/smart_ptr/intrusive_ptr.hpp>
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#include <boost/log/detail/thread_id.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/attribute_value_impl.hpp>
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#include <boost/log/detail/header.hpp>
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namespace boost {
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BOOST_LOG_OPEN_NAMESPACE
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//! Thread identifier type
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typedef boost::log::aux::thread::id thread_id;
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namespace attributes {
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/*!
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* \brief A class of an attribute that always returns the current thread identifier
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*
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* \note This attribute can be registered globally, it will still return the correct
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* thread identifier, no matter which thread emits the log record.
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*/
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class current_thread_id :
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public attribute
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{
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public:
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//! A held attribute value type
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typedef thread_id value_type;
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protected:
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//! Factory implementation
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class BOOST_SYMBOL_VISIBLE impl :
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public attribute_value::impl
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{
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public:
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bool dispatch(type_dispatcher& dispatcher)
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{
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type_dispatcher::callback< value_type > callback =
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dispatcher.get_callback< value_type >();
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if (callback)
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{
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callback(boost::log::aux::this_thread::get_id());
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return true;
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}
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else
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return false;
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}
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intrusive_ptr< attribute_value::impl > detach_from_thread()
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{
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typedef attribute_value_impl< value_type > detached_value;
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return new detached_value(boost::log::aux::this_thread::get_id());
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}
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typeindex::type_index get_type() const { return typeindex::type_id< value_type >(); }
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};
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public:
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/*!
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* Default constructor
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*/
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current_thread_id() : attribute(new impl())
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{
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}
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/*!
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* Constructor for casting support
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*/
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explicit current_thread_id(cast_source const& source) :
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attribute(source.as< impl >())
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{
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}
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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_CURRENT_THREAD_ID_HPP_INCLUDED_
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