68 lines
1.6 KiB
C++
68 lines
1.6 KiB
C++
/*
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* Copyright Andrey Semashev 2007 - 2015.
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*/
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/*!
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* \file is_keyword_descriptor.hpp
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* \author Andrey Semashev
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* \date 14.07.2012
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*
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* The header contains attribute keyword descriptor detection trait.
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*/
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#ifndef BOOST_LOG_EXPRESSIONS_IS_KEYWORD_DESCRIPTOR_HPP_INCLUDED_
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#define BOOST_LOG_EXPRESSIONS_IS_KEYWORD_DESCRIPTOR_HPP_INCLUDED_
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#include <boost/mpl/bool.hpp>
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#include <boost/log/detail/config.hpp>
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#include <boost/log/detail/header.hpp>
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#ifdef BOOST_HAS_PRAGMA_ONCE
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#pragma once
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#endif
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namespace boost {
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BOOST_LOG_OPEN_NAMESPACE
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namespace expressions {
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/*!
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* Base class for keyword descriptors. All keyword descriptors must derive from this class to support the \c is_keyword_descriptor trait.
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*/
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struct keyword_descriptor
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{
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#ifndef BOOST_LOG_DOXYGEN_PASS
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typedef void _is_boost_log_keyword_descriptor;
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#endif // BOOST_LOG_DOXYGEN_PASS
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};
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/*!
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* The metafunction detects if the type \c T is a keyword descriptor
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*/
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template< typename T, typename VoidT = void >
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struct is_keyword_descriptor :
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public mpl::false_
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{
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};
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#ifndef BOOST_LOG_DOXYGEN_PASS
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template< typename T >
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struct is_keyword_descriptor< T, typename T::_is_boost_log_keyword_descriptor > :
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public mpl::true_
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{
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};
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#endif
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} // namespace expressions
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BOOST_LOG_CLOSE_NAMESPACE // namespace log
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} // namespace boost
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#include <boost/log/detail/footer.hpp>
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#endif // BOOST_LOG_EXPRESSIONS_IS_KEYWORD_DESCRIPTOR_HPP_INCLUDED_
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