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