151 lines
3.9 KiB
C++
151 lines
3.9 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 sources/features.hpp
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* \author Andrey Semashev
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* \date 17.07.2009
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*
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* The header contains definition of a features list class template.
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*/
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#ifndef BOOST_LOG_SOURCES_FEATURES_HPP_INCLUDED_
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#define BOOST_LOG_SOURCES_FEATURES_HPP_INCLUDED_
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#include <boost/mpl/lambda.hpp>
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#include <boost/log/detail/config.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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#if defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
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#include <boost/preprocessor/repetition/enum_params.hpp>
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#include <boost/preprocessor/repetition/enum_binary_params.hpp>
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#include <boost/preprocessor/repetition/enum_shifted_params.hpp>
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#include <boost/preprocessor/facilities/intercept.hpp>
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//! The macro defines the maximum number of features that can be specified for a logger
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#ifndef BOOST_LOG_FEATURES_LIMIT
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#define BOOST_LOG_FEATURES_LIMIT 10
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#endif // BOOST_LOG_FEATURES_LIMIT
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#endif
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#include <boost/log/detail/header.hpp>
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namespace boost {
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BOOST_LOG_OPEN_NAMESPACE
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namespace sources {
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#if defined(BOOST_LOG_DOXYGEN_PASS) || !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
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/*!
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* \brief A type sequence of logger features
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*
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* This class template can be used to specify logger features in a \c basic_composite_logger instantiation.
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*/
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template< typename... FeaturesT >
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struct features
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{
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};
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namespace aux {
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//! The metafunction produces the inherited features hierarchy with \c RootT as the ultimate base type
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template< typename RootT, typename FeaturesT >
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struct inherit_features;
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template< typename RootT, typename FeatureT0, typename... FeaturesT >
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struct inherit_features< RootT, features< FeatureT0, FeaturesT... > >
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{
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typedef typename mpl::lambda<
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FeatureT0
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>::type::BOOST_NESTED_TEMPLATE apply<
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typename inherit_features<
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RootT,
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features< FeaturesT... >
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>::type
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>::type type;
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};
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template< typename RootT, typename FeatureT0 >
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struct inherit_features< RootT, features< FeatureT0 > >
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{
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typedef typename mpl::lambda<
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FeatureT0
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>::type::BOOST_NESTED_TEMPLATE apply<
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RootT
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>::type type;
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};
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template< typename RootT >
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struct inherit_features< RootT, features< > >
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{
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typedef RootT type;
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};
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} // namespace aux
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#else
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//! A type sequence of logger features
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template< BOOST_PP_ENUM_BINARY_PARAMS(BOOST_LOG_FEATURES_LIMIT, typename FeatureT, = void BOOST_PP_INTERCEPT) >
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struct features
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{
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};
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namespace aux {
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template< typename RootT, typename FeaturesT >
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struct inherit_features;
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template< typename RootT, BOOST_PP_ENUM_PARAMS(BOOST_LOG_FEATURES_LIMIT, typename FeatureT) >
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struct inherit_features< RootT, features< BOOST_PP_ENUM_PARAMS(BOOST_LOG_FEATURES_LIMIT, FeatureT) > >
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{
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typedef typename mpl::lambda<
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FeatureT0
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>::type::BOOST_NESTED_TEMPLATE apply<
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typename inherit_features<
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RootT,
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features< BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_LOG_FEATURES_LIMIT, FeatureT) >
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>::type
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>::type type;
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};
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template< typename RootT, typename FeatureT0 >
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struct inherit_features< RootT, features< FeatureT0, BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_LOG_FEATURES_LIMIT, void BOOST_PP_INTERCEPT) > >
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{
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typedef typename mpl::lambda<
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FeatureT0
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>::type::BOOST_NESTED_TEMPLATE apply<
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RootT
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>::type type;
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};
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template< typename RootT >
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struct inherit_features< RootT, features< BOOST_PP_ENUM_PARAMS(BOOST_LOG_FEATURES_LIMIT, void BOOST_PP_INTERCEPT) > >
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{
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typedef RootT type;
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};
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} // namespace aux
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#endif
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} // namespace sources
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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_SOURCES_FEATURES_HPP_INCLUDED_
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