Added thirdparty: boost library

thirdparty/include/boost/log/attributes/value_visitation_fwd.hpp

@@ -0,0 +1,45 @@
+/*
+ *          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   value_visitation_fwd.hpp
+ * \author Andrey Semashev
+ * \date   01.03.2008
+ *
+ * The header contains forward declaration of convenience tools to apply visitors to an attribute value
+ * in the view.
+ */
+
+#ifndef BOOST_LOG_ATTRIBUTES_VALUE_VISITATION_FWD_HPP_INCLUDED_
+#define BOOST_LOG_ATTRIBUTES_VALUE_VISITATION_FWD_HPP_INCLUDED_
+
+#include <boost/log/detail/config.hpp>
+#include <boost/log/attributes/fallback_policy_fwd.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+namespace boost {
+
+BOOST_LOG_OPEN_NAMESPACE
+
+/*!
+ * \brief The class represents attribute value visitation result
+ */
+class visitation_result;
+
+/*!
+ * \brief Generic attribute value visitor invoker
+ */
+template< typename T, typename FallbackPolicyT = fallback_to_none >
+class value_visitor_invoker;
+
+BOOST_LOG_CLOSE_NAMESPACE // namespace log
+
+} // namespace boost
+
+#endif // BOOST_LOG_ATTRIBUTES_VALUE_VISITATION_FWD_HPP_INCLUDED_