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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 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_
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