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/*
* Copyright Andrey Semashev 2007 - 2014.
* 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 sources/features.hpp
* \author Andrey Semashev
* \date 17.07.2009
*
* The header contains definition of a features list class template.
*/
#ifndef BOOST_LOG_SOURCES_FEATURES_HPP_INCLUDED_
#define BOOST_LOG_SOURCES_FEATURES_HPP_INCLUDED_
#include <boost/mpl/lambda.hpp>
#include <boost/log/detail/config.hpp>
#ifdef BOOST_HAS_PRAGMA_ONCE
#pragma once
#endif
#if defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
#include <boost/preprocessor/repetition/enum_params.hpp>
#include <boost/preprocessor/repetition/enum_binary_params.hpp>
#include <boost/preprocessor/repetition/enum_shifted_params.hpp>
#include <boost/preprocessor/facilities/intercept.hpp>
//! The macro defines the maximum number of features that can be specified for a logger
#ifndef BOOST_LOG_FEATURES_LIMIT
#define BOOST_LOG_FEATURES_LIMIT 10
#endif // BOOST_LOG_FEATURES_LIMIT
#endif
#include <boost/log/detail/header.hpp>
namespace boost {
BOOST_LOG_OPEN_NAMESPACE
namespace sources {
#if defined(BOOST_LOG_DOXYGEN_PASS) || !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
/*!
* \brief A type sequence of logger features
*
* This class template can be used to specify logger features in a \c basic_composite_logger instantiation.
*/
template< typename... FeaturesT >
struct features
{
};
namespace aux {
//! The metafunction produces the inherited features hierarchy with \c RootT as the ultimate base type
template< typename RootT, typename FeaturesT >
struct inherit_features;
template< typename RootT, typename FeatureT0, typename... FeaturesT >
struct inherit_features< RootT, features< FeatureT0, FeaturesT... > >
{
typedef typename mpl::lambda<
FeatureT0
>::type::BOOST_NESTED_TEMPLATE apply<
typename inherit_features<
RootT,
features< FeaturesT... >
>::type
>::type type;
};
template< typename RootT, typename FeatureT0 >
struct inherit_features< RootT, features< FeatureT0 > >
{
typedef typename mpl::lambda<
FeatureT0
>::type::BOOST_NESTED_TEMPLATE apply<
RootT
>::type type;
};
template< typename RootT >
struct inherit_features< RootT, features< > >
{
typedef RootT type;
};
} // namespace aux
#else
//! A type sequence of logger features
template< BOOST_PP_ENUM_BINARY_PARAMS(BOOST_LOG_FEATURES_LIMIT, typename FeatureT, = void BOOST_PP_INTERCEPT) >
struct features
{
};
namespace aux {
template< typename RootT, typename FeaturesT >
struct inherit_features;
template< typename RootT, BOOST_PP_ENUM_PARAMS(BOOST_LOG_FEATURES_LIMIT, typename FeatureT) >
struct inherit_features< RootT, features< BOOST_PP_ENUM_PARAMS(BOOST_LOG_FEATURES_LIMIT, FeatureT) > >
{
typedef typename mpl::lambda<
FeatureT0
>::type::BOOST_NESTED_TEMPLATE apply<
typename inherit_features<
RootT,
features< BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_LOG_FEATURES_LIMIT, FeatureT) >
>::type
>::type type;
};
template< typename RootT, typename FeatureT0 >
struct inherit_features< RootT, features< FeatureT0, BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_LOG_FEATURES_LIMIT, void BOOST_PP_INTERCEPT) > >
{
typedef typename mpl::lambda<
FeatureT0
>::type::BOOST_NESTED_TEMPLATE apply<
RootT
>::type type;
};
template< typename RootT >
struct inherit_features< RootT, features< BOOST_PP_ENUM_PARAMS(BOOST_LOG_FEATURES_LIMIT, void BOOST_PP_INTERCEPT) > >
{
typedef RootT type;
};
} // namespace aux
#endif
} // namespace sources
BOOST_LOG_CLOSE_NAMESPACE // namespace log
} // namespace boost
#include <boost/log/detail/footer.hpp>
#endif // BOOST_LOG_SOURCES_FEATURES_HPP_INCLUDED_
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