Chris@16: /*
Chris@101:  *          Copyright Andrey Semashev 2007 - 2015.
Chris@16:  * Distributed under the Boost Software License, Version 1.0.
Chris@16:  *    (See accompanying file LICENSE_1_0.txt or copy at
Chris@16:  *          http://www.boost.org/LICENSE_1_0.txt)
Chris@16:  */
Chris@16: /*!
Chris@16:  * \file   sources/features.hpp
Chris@16:  * \author Andrey Semashev
Chris@16:  * \date   17.07.2009
Chris@16:  *
Chris@16:  * The header contains definition of a features list class template.
Chris@16:  */
Chris@16: 
Chris@16: #ifndef BOOST_LOG_SOURCES_FEATURES_HPP_INCLUDED_
Chris@16: #define BOOST_LOG_SOURCES_FEATURES_HPP_INCLUDED_
Chris@16: 
Chris@16: #include <boost/mpl/lambda.hpp>
Chris@16: #include <boost/log/detail/config.hpp>
Chris@16: 
Chris@16: #ifdef BOOST_HAS_PRAGMA_ONCE
Chris@16: #pragma once
Chris@16: #endif
Chris@16: 
Chris@16: #if defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
Chris@16: 
Chris@16: #include <boost/preprocessor/repetition/enum_params.hpp>
Chris@101: #include <boost/preprocessor/repetition/enum_binary_params.hpp>
Chris@16: #include <boost/preprocessor/repetition/enum_shifted_params.hpp>
Chris@16: #include <boost/preprocessor/facilities/intercept.hpp>
Chris@16: 
Chris@16: //! The macro defines the maximum number of features that can be specified for a logger
Chris@16: #ifndef BOOST_LOG_FEATURES_LIMIT
Chris@16: #define BOOST_LOG_FEATURES_LIMIT 10
Chris@16: #endif // BOOST_LOG_FEATURES_LIMIT
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16: #include <boost/log/detail/header.hpp>
Chris@16: 
Chris@16: namespace boost {
Chris@16: 
Chris@16: BOOST_LOG_OPEN_NAMESPACE
Chris@16: 
Chris@16: namespace sources {
Chris@16: 
Chris@16: #if defined(BOOST_LOG_DOXYGEN_PASS) || !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
Chris@16: 
Chris@16: /*!
Chris@16:  * \brief A type sequence of logger features
Chris@16:  *
Chris@16:  * This class template can be used to specify logger features in a \c basic_composite_logger instantiation.
Chris@16:  */
Chris@16: template< typename... FeaturesT >
Chris@16: struct features
Chris@16: {
Chris@16: };
Chris@16: 
Chris@16: namespace aux {
Chris@16: 
Chris@16: //! The metafunction produces the inherited features hierarchy with \c RootT as the ultimate base type
Chris@16: template< typename RootT, typename FeaturesT >
Chris@16: struct inherit_features;
Chris@16: 
Chris@16: template< typename RootT, typename FeatureT0, typename... FeaturesT >
Chris@16: struct inherit_features< RootT, features< FeatureT0, FeaturesT... > >
Chris@16: {
Chris@16:     typedef typename mpl::lambda<
Chris@16:         FeatureT0
Chris@16:     >::type::BOOST_NESTED_TEMPLATE apply<
Chris@16:         typename inherit_features<
Chris@16:             RootT,
Chris@16:             features< FeaturesT... >
Chris@16:         >::type
Chris@16:     >::type type;
Chris@16: };
Chris@16: 
Chris@16: template< typename RootT, typename FeatureT0 >
Chris@16: struct inherit_features< RootT, features< FeatureT0 > >
Chris@16: {
Chris@16:     typedef typename mpl::lambda<
Chris@16:         FeatureT0
Chris@16:     >::type::BOOST_NESTED_TEMPLATE apply<
Chris@16:         RootT
Chris@16:     >::type type;
Chris@16: };
Chris@16: 
Chris@16: template< typename RootT >
Chris@16: struct inherit_features< RootT, features< > >
Chris@16: {
Chris@16:     typedef RootT type;
Chris@16: };
Chris@16: 
Chris@16: } // namespace aux
Chris@16: 
Chris@16: #else
Chris@16: 
Chris@16: //! A type sequence of logger features
Chris@16: template< BOOST_PP_ENUM_BINARY_PARAMS(BOOST_LOG_FEATURES_LIMIT, typename FeatureT, = void BOOST_PP_INTERCEPT) >
Chris@16: struct features
Chris@16: {
Chris@16: };
Chris@16: 
Chris@16: namespace aux {
Chris@16: 
Chris@16: template< typename RootT, typename FeaturesT >
Chris@16: struct inherit_features;
Chris@16: 
Chris@16: template< typename RootT, BOOST_PP_ENUM_PARAMS(BOOST_LOG_FEATURES_LIMIT, typename FeatureT) >
Chris@16: struct inherit_features< RootT, features< BOOST_PP_ENUM_PARAMS(BOOST_LOG_FEATURES_LIMIT, FeatureT) > >
Chris@16: {
Chris@16:     typedef typename mpl::lambda<
Chris@16:         FeatureT0
Chris@16:     >::type::BOOST_NESTED_TEMPLATE apply<
Chris@16:         typename inherit_features<
Chris@16:             RootT,
Chris@16:             features< BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_LOG_FEATURES_LIMIT, FeatureT) >
Chris@16:         >::type
Chris@16:     >::type type;
Chris@16: };
Chris@16: 
Chris@16: template< typename RootT, typename FeatureT0 >
Chris@16: struct inherit_features< RootT, features< FeatureT0, BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_LOG_FEATURES_LIMIT, void BOOST_PP_INTERCEPT) > >
Chris@16: {
Chris@16:     typedef typename mpl::lambda<
Chris@16:         FeatureT0
Chris@16:     >::type::BOOST_NESTED_TEMPLATE apply<
Chris@16:         RootT
Chris@16:     >::type type;
Chris@16: };
Chris@16: 
Chris@16: template< typename RootT >
Chris@16: struct inherit_features< RootT, features< BOOST_PP_ENUM_PARAMS(BOOST_LOG_FEATURES_LIMIT, void BOOST_PP_INTERCEPT) > >
Chris@16: {
Chris@16:     typedef RootT type;
Chris@16: };
Chris@16: 
Chris@16: } // namespace aux
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16: } // namespace sources
Chris@16: 
Chris@16: BOOST_LOG_CLOSE_NAMESPACE // namespace log
Chris@16: 
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #include <boost/log/detail/footer.hpp>
Chris@16: 
Chris@16: #endif // BOOST_LOG_SOURCES_FEATURES_HPP_INCLUDED_