/*
|
* 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 is_keyword_descriptor.hpp
|
* \author Andrey Semashev
|
* \date 14.07.2012
|
*
|
* The header contains attribute keyword descriptor detection trait.
|
*/
|
|
#ifndef BOOST_LOG_EXPRESSIONS_IS_KEYWORD_DESCRIPTOR_HPP_INCLUDED_
|
#define BOOST_LOG_EXPRESSIONS_IS_KEYWORD_DESCRIPTOR_HPP_INCLUDED_
|
|
#include <boost/mpl/bool.hpp>
|
#include <boost/log/detail/config.hpp>
|
#include <boost/log/detail/header.hpp>
|
|
#ifdef BOOST_HAS_PRAGMA_ONCE
|
#pragma once
|
#endif
|
|
namespace boost {
|
|
BOOST_LOG_OPEN_NAMESPACE
|
|
namespace expressions {
|
|
/*!
|
* Base class for keyword descriptors. All keyword descriptors must derive from this class to support the \c is_keyword_descriptor trait.
|
*/
|
struct keyword_descriptor
|
{
|
#ifndef BOOST_LOG_DOXYGEN_PASS
|
typedef void _is_boost_log_keyword_descriptor;
|
#endif // BOOST_LOG_DOXYGEN_PASS
|
};
|
|
/*!
|
* The metafunction detects if the type \c T is a keyword descriptor
|
*/
|
template< typename T, typename VoidT = void >
|
struct is_keyword_descriptor :
|
public mpl::false_
|
{
|
};
|
|
#ifndef BOOST_LOG_DOXYGEN_PASS
|
template< typename T >
|
struct is_keyword_descriptor< T, typename T::_is_boost_log_keyword_descriptor > :
|
public mpl::true_
|
{
|
};
|
#endif
|
|
} // namespace expressions
|
|
BOOST_LOG_CLOSE_NAMESPACE // namespace log
|
|
} // namespace boost
|
|
#include <boost/log/detail/footer.hpp>
|
|
#endif // BOOST_LOG_EXPRESSIONS_IS_KEYWORD_DESCRIPTOR_HPP_INCLUDED_
|
