boost/log/expressions/message.hpp
/*
* 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 message.hpp
* \author Andrey Semashev
* \date 13.07.2012
*
* The header contains log message keyword declaration.
*/
#ifndef BOOST_LOG_EXPRESSIONS_MESSAGE_HPP_INCLUDED_
#define BOOST_LOG_EXPRESSIONS_MESSAGE_HPP_INCLUDED_
#include <string>
#include <boost/mpl/vector.hpp>
#include <boost/log/detail/config.hpp>
#include <boost/log/detail/default_attribute_names.hpp>
#include <boost/log/expressions/keyword.hpp>
#include <boost/log/expressions/is_keyword_descriptor.hpp>
#include <boost/log/attributes/attribute_name.hpp>
#include <boost/log/detail/header.hpp>
#ifdef BOOST_HAS_PRAGMA_ONCE
#pragma once
#endif
namespace boost {
BOOST_LOG_OPEN_NAMESPACE
namespace expressions {
namespace tag {
/*!
* Generic log message attribute descriptor.
*/
struct message :
public keyword_descriptor
{
// The attribute value type here is not essential since message attributes are not intended to be created via the keyword
typedef void attribute_type;
#if defined(BOOST_LOG_USE_CHAR) && defined(BOOST_LOG_USE_WCHAR_T)
typedef mpl::vector2< std::string, std::wstring > value_type;
#elif defined(BOOST_LOG_USE_CHAR)
typedef std::string value_type;
#elif defined(BOOST_LOG_USE_WCHAR_T)
typedef std::wstring value_type;
#endif
static attribute_name get_name() { return boost::log::aux::default_attribute_names::message(); }
};
#if defined(BOOST_LOG_USE_CHAR)
/*!
* Narrow character log message attribute descriptor.
*/
struct smessage :
public keyword_descriptor
{
// The attribute value type here is not essential since message attributes are not intended to be created via the keyword
typedef void attribute_type;
typedef std::string value_type;
static attribute_name get_name() { return boost::log::aux::default_attribute_names::message(); }
};
#endif
#if defined(BOOST_LOG_USE_WCHAR_T)
/*!
* Wide character log message attribute descriptor.
*/
struct wmessage :
public keyword_descriptor
{
// The attribute value type here is not essential since message attributes are not intended to be created via the keyword
typedef void attribute_type;
typedef std::wstring value_type;
static attribute_name get_name() { return boost::log::aux::default_attribute_names::message(); }
};
#endif
} // namespace tag
/*!
* Generic message keyword type.
*/
typedef attribute_keyword< tag::message > message_type;
/*!
* Generic message keyword.
*/
const message_type message = {};
#if defined(BOOST_LOG_USE_CHAR)
/*!
* Narrow message keyword type.
*/
typedef attribute_keyword< tag::smessage > smessage_type;
/*!
* Narrow message keyword.
*/
const smessage_type smessage = {};
#endif
#if defined(BOOST_LOG_USE_WCHAR_T)
/*!
* Wide message keyword type.
*/
typedef attribute_keyword< tag::wmessage > wmessage_type;
/*!
* Wide message keyword.
*/
const wmessage_type wmessage = {};
#endif
} // namespace expressions
BOOST_LOG_CLOSE_NAMESPACE // namespace log
} // namespace boost
#include <boost/log/detail/footer.hpp>
#endif // BOOST_LOG_EXPRESSIONS_MESSAGE_HPP_INCLUDED_