comparison DEPENDENCIES/generic/include/boost/log/sinks/frontend_requirements.hpp @ 16:2665513ce2d3

Add boost headers

+/*
+ *          Copyright Andrey Semashev 2007 - 2013.
+ * 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   sinks/frontend_requirements.hpp
+ * \author Andrey Semashev
+ * \date   22.04.2007
+ *
+ * The header contains definition of requirement tags that sink backend may declare
+ * with regard to frontends. These requirements ensure that a backend will not
+ * be used with an incompatible frontend.
+ */
+
+#ifndef BOOST_LOG_SINKS_FRONTEND_REQUIREMENTS_HPP_INCLUDED_
+#define BOOST_LOG_SINKS_FRONTEND_REQUIREMENTS_HPP_INCLUDED_
+
+#include <boost/mpl/aux_/na.hpp>
+#include <boost/mpl/placeholders.hpp>
+#include <boost/mpl/inherit.hpp>
+#include <boost/mpl/inherit_linearly.hpp>
+#include <boost/mpl/vector.hpp>
+#include <boost/preprocessor/repetition/enum_params.hpp>
+#include <boost/preprocessor/repetition/enum_params_with_a_default.hpp>
+#include <boost/type_traits/is_base_of.hpp>
+#include <boost/log/detail/config.hpp>
+#include <boost/log/detail/header.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+#ifndef BOOST_LOG_COMBINE_REQUIREMENTS_LIMIT
+//! The macro specifies the maximum number of requirements that can be combined with the \c combine_requirements metafunction
+#define BOOST_LOG_COMBINE_REQUIREMENTS_LIMIT 5
+#endif
+
+namespace boost {
+
+BOOST_LOG_OPEN_NAMESPACE
+
+namespace sinks {
+
+/*!
+ * The sink backend expects pre-synchronized calls, all needed synchronization is implemented
+ * in the frontend (IOW, only one thread is feeding records to the backend concurrently, but
+ * it is possible for several threads to write sequentially). Note that if a frontend supports
+ * synchronized record feeding, it will also report capable of concurrent record feeding.
+ */
+struct synchronized_feeding {};
+
+#if !defined(BOOST_LOG_NO_THREADS)
+
+/*!
+ * The sink backend ensures all needed synchronization, it is capable to handle multithreaded calls
+ */
+struct concurrent_feeding : synchronized_feeding {};
+
+#else // !defined(BOOST_LOG_NO_THREADS)
+
+//  If multithreading is disabled, threading models become redundant
+typedef synchronized_feeding concurrent_feeding;
+
+#endif // !defined(BOOST_LOG_NO_THREADS)
+
+/*!
+ * The sink backend requires the frontend to perform log record formatting before feeding
+ */
+struct formatted_records {};
+
+/*!
+ * The sink backend supports flushing
+ */
+struct flushing {};
+
+#ifdef BOOST_LOG_DOXYGEN_PASS
+
+/*!
+ * The metafunction combines multiple requirement tags into one type. The resulting type will
+ * satisfy all specified requirements (i.e. \c has_requirement metafunction will return positive result).
+ */
+template< typename... RequirementsT >
+struct combine_requirements;
+
+#else
+
+template< BOOST_PP_ENUM_PARAMS_WITH_A_DEFAULT(BOOST_LOG_COMBINE_REQUIREMENTS_LIMIT, typename ReqT, mpl::na) >
+struct combine_requirements :
+    mpl::inherit_linearly<
+        mpl::vector< BOOST_PP_ENUM_PARAMS(BOOST_LOG_COMBINE_REQUIREMENTS_LIMIT, ReqT) >,
+        mpl::inherit2< mpl::_1, mpl::_2 >
+    >
+{
+};
+
+#endif // BOOST_LOG_DOXYGEN_PASS
+
+/*!
+ * A helper metafunction to check if a requirement is satisfied. The \c TestedT template argument
+ * should be the type combining one or several requirements and \c RequiredT is the requirement
+ * to test against. The metafunction will yield a positive result if \c TestedT supports \c RequiredT.
+ */
+template< typename TestedT, typename RequiredT >
+struct has_requirement :
+    public is_base_of< RequiredT, TestedT >
+{
+};
+
+} // namespace sinks
+
+BOOST_LOG_CLOSE_NAMESPACE // namespace log
+
+} // namespace boost
+
+#include <boost/log/detail/footer.hpp>
+
+#endif // BOOST_LOG_SINKS_FRONTEND_REQUIREMENTS_HPP_INCLUDED_