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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 scoped_attribute.hpp
* \author Andrey Semashev
* \date 13.05.2007
*
* The header contains definition of facilities to define scoped attributes.
*/
#ifndef BOOST_LOG_ATTRIBUTES_SCOPED_ATTRIBUTE_HPP_INCLUDED_
#define BOOST_LOG_ATTRIBUTES_SCOPED_ATTRIBUTE_HPP_INCLUDED_
#include <utility>
#include <boost/move/core.hpp>
#include <boost/move/utility.hpp>
#include <boost/utility/addressof.hpp>
#include <boost/log/detail/config.hpp>
#include <boost/log/core/core.hpp>
#include <boost/log/sources/basic_logger.hpp>
#include <boost/log/attributes/attribute.hpp>
#include <boost/log/attributes/attribute_set.hpp>
#include <boost/log/attributes/attribute_name.hpp>
#include <boost/log/attributes/constant.hpp>
#include <boost/log/utility/unused_variable.hpp>
#include <boost/log/utility/unique_identifier_name.hpp>
#include <boost/log/detail/header.hpp>
#ifdef BOOST_HAS_PRAGMA_ONCE
#pragma once
#endif
namespace boost {
BOOST_LOG_OPEN_NAMESPACE
namespace aux {
//! A base class for all scoped attribute guards
class attribute_scope_guard
{
};
} // namespace aux
//! Scoped attribute guard type
typedef aux::attribute_scope_guard const& scoped_attribute;
namespace aux {
//! A scoped logger attribute guard
template< typename LoggerT >
class scoped_logger_attribute :
public attribute_scope_guard
{
BOOST_COPYABLE_AND_MOVABLE_ALT(scoped_logger_attribute)
private:
//! Logger type
typedef LoggerT logger_type;
private:
//! A reference to the logger
logger_type* m_pLogger;
//! An iterator to the added attribute
attribute_set::iterator m_itAttribute;
public:
//! Constructor
scoped_logger_attribute(logger_type& l, attribute_name const& name, attribute const& attr) :
m_pLogger(boost::addressof(l))
{
std::pair<
attribute_set::iterator,
bool
> res = l.add_attribute(name, attr);
if (res.second)
m_itAttribute = res.first;
else
m_pLogger = 0; // if there already is a same-named attribute, don't register anything
}
//! Move constructor
scoped_logger_attribute(BOOST_RV_REF(scoped_logger_attribute) that) :
m_pLogger(that.m_pLogger),
m_itAttribute(that.m_itAttribute)
{
that.m_pLogger = 0;
}
//! Destructor
~scoped_logger_attribute()
{
if (m_pLogger)
m_pLogger->remove_attribute(m_itAttribute);
}
#ifndef BOOST_LOG_BROKEN_REFERENCE_FROM_RVALUE_INIT
BOOST_DELETED_FUNCTION(scoped_logger_attribute(scoped_logger_attribute const&))
#else // BOOST_LOG_BROKEN_REFERENCE_FROM_RVALUE_INIT
scoped_logger_attribute(scoped_logger_attribute const& that) : m_pLogger(that.m_pLogger), m_itAttribute(that.m_itAttribute)
{
const_cast< scoped_logger_attribute& >(that).m_pLogger = 0;
}
#endif // BOOST_LOG_BROKEN_REFERENCE_FROM_RVALUE_INIT
BOOST_DELETED_FUNCTION(scoped_logger_attribute& operator= (scoped_logger_attribute const&))
};
} // namespace aux
// Generator helper functions
/*!
* Registers an attribute in the logger
*
* \param l Logger to register the attribute in
* \param name Attribute name
* \param attr The attribute. Must not be NULL.
* \return An unspecified guard object which may be used to initialize a \c scoped_attribute variable.
*/
template< typename LoggerT >
BOOST_FORCEINLINE aux::scoped_logger_attribute< LoggerT > add_scoped_logger_attribute(LoggerT& l, attribute_name const& name, attribute const& attr)
{
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
return aux::scoped_logger_attribute< LoggerT >(l, name, attr);
#else
aux::scoped_logger_attribute< LoggerT > guard(l, name, attr);
return boost::move(guard);
#endif
}
#ifndef BOOST_LOG_DOXYGEN_PASS
#define BOOST_LOG_SCOPED_LOGGER_ATTR_INTERNAL(logger, attr_name, attr, sentry_var_name)\
BOOST_LOG_UNUSED_VARIABLE(::boost::log::scoped_attribute, sentry_var_name,\
= ::boost::log::add_scoped_logger_attribute(logger, attr_name, (attr)));
#endif // BOOST_LOG_DOXYGEN_PASS
//! The macro sets a scoped logger-wide attribute in a more compact way
#define BOOST_LOG_SCOPED_LOGGER_ATTR(logger, attr_name, attr)\
BOOST_LOG_SCOPED_LOGGER_ATTR_INTERNAL(\
logger,\
attr_name,\
attr,\
BOOST_LOG_UNIQUE_IDENTIFIER_NAME(_boost_log_scoped_logger_attr_sentry_))
//! The macro sets a scoped logger-wide tag in a more compact way
#define BOOST_LOG_SCOPED_LOGGER_TAG(logger, attr_name, attr_value)\
BOOST_LOG_SCOPED_LOGGER_ATTR(logger, attr_name, ::boost::log::attributes::make_constant(attr_value))
namespace aux {
//! A scoped thread-specific attribute guard
class scoped_thread_attribute :
public attribute_scope_guard
{
BOOST_COPYABLE_AND_MOVABLE_ALT(scoped_thread_attribute)
private:
//! A pointer to the logging core
core_ptr m_pCore;
//! An iterator to the added attribute
attribute_set::iterator m_itAttribute;
public:
//! Constructor
scoped_thread_attribute(attribute_name const& name, attribute const& attr) :
m_pCore(core::get())
{
std::pair<
attribute_set::iterator,
bool
> res = m_pCore->add_thread_attribute(name, attr);
if (res.second)
m_itAttribute = res.first;
else
m_pCore.reset(); // if there already is a same-named attribute, don't register anything
}
//! Move constructor
scoped_thread_attribute(BOOST_RV_REF(scoped_thread_attribute) that) : m_itAttribute(that.m_itAttribute)
{
m_pCore.swap(that.m_pCore);
}
//! Destructor
~scoped_thread_attribute()
{
if (!!m_pCore)
m_pCore->remove_thread_attribute(m_itAttribute);
}
#ifndef BOOST_LOG_BROKEN_REFERENCE_FROM_RVALUE_INIT
BOOST_DELETED_FUNCTION(scoped_thread_attribute(scoped_thread_attribute const&))
#else // BOOST_LOG_BROKEN_REFERENCE_FROM_RVALUE_INIT
scoped_thread_attribute(scoped_thread_attribute const& that) : m_itAttribute(that.m_itAttribute)
{
m_pCore.swap(const_cast< scoped_thread_attribute& >(that).m_pCore);
}
#endif // BOOST_LOG_BROKEN_REFERENCE_FROM_RVALUE_INIT
BOOST_DELETED_FUNCTION(scoped_thread_attribute& operator= (scoped_thread_attribute const&))
};
} // namespace aux
// Generator helper functions
/*!
* Registers a thread-specific attribute
*
* \param name Attribute name
* \param attr The attribute. Must not be NULL.
* \return An unspecified guard object which may be used to initialize a \c scoped_attribute variable.
*/
BOOST_FORCEINLINE aux::scoped_thread_attribute add_scoped_thread_attribute(attribute_name const& name, attribute const& attr)
{
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
return aux::scoped_thread_attribute(name, attr);
#else
aux::scoped_thread_attribute guard(name, attr);
return boost::move(guard);
#endif
}
#ifndef BOOST_LOG_DOXYGEN_PASS
#define BOOST_LOG_SCOPED_THREAD_ATTR_INTERNAL(attr_name, attr, sentry_var_name)\
BOOST_LOG_UNUSED_VARIABLE(::boost::log::scoped_attribute, sentry_var_name,\
= ::boost::log::add_scoped_thread_attribute(attr_name, (attr)));
#endif // BOOST_LOG_DOXYGEN_PASS
//! The macro sets a scoped thread-wide attribute in a more compact way
#define BOOST_LOG_SCOPED_THREAD_ATTR(attr_name, attr)\
BOOST_LOG_SCOPED_THREAD_ATTR_INTERNAL(\
attr_name,\
attr,\
BOOST_LOG_UNIQUE_IDENTIFIER_NAME(_boost_log_scoped_thread_attr_sentry_))
//! The macro sets a scoped thread-wide tag in a more compact way
#define BOOST_LOG_SCOPED_THREAD_TAG(attr_name, attr_value)\
BOOST_LOG_SCOPED_THREAD_ATTR(attr_name, ::boost::log::attributes::make_constant(attr_value))
BOOST_LOG_CLOSE_NAMESPACE // namespace log
} // namespace boost
#include <boost/log/detail/footer.hpp>
#endif // BOOST_LOG_ATTRIBUTES_SCOPED_ATTRIBUTE_HPP_INCLUDED_
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