text: /*
   *          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   channel_severity_filter.hpp
   * \author Andrey Semashev
   * \date   25.11.2012
   *
   * The header contains implementation of a minimal severity per channel filter.
   */
  
  #ifndef BOOST_LOG_EXPRESSIONS_PREDICATES_CHANNEL_SEVERITY_FILTER_HPP_INCLUDED_
  #define BOOST_LOG_EXPRESSIONS_PREDICATES_CHANNEL_SEVERITY_FILTER_HPP_INCLUDED_
  
  #include <map>
  #include <memory>
  #include <utility>
  #include <boost/phoenix/core/actor.hpp>
  #include <boost/phoenix/core/terminal_fwd.hpp>
  #include <boost/phoenix/core/is_nullary.hpp>
  #include <boost/phoenix/core/environment.hpp>
  #include <boost/fusion/sequence/intrinsic/at_c.hpp>
  #include <boost/type_traits/remove_cv.hpp>
  #include <boost/type_traits/remove_reference.hpp>
  #include <boost/log/detail/config.hpp>
  #include <boost/log/detail/custom_terminal_spec.hpp>
  #include <boost/log/attributes/attribute_name.hpp>
  #include <boost/log/attributes/fallback_policy.hpp>
  #include <boost/log/attributes/value_visitation.hpp>
  #include <boost/log/utility/functional/logical.hpp>
  #include <boost/log/expressions/attr_fwd.hpp>
  #include <boost/log/expressions/keyword_fwd.hpp>
  #include <boost/log/detail/header.hpp>
  
  #ifdef BOOST_HAS_PRAGMA_ONCE
  #pragma once
  #endif
  
  namespace boost {
  
  BOOST_LOG_OPEN_NAMESPACE
  
  namespace expressions {
  
  template<
      typename ChannelT,
      typename SeverityT,
      typename ChannelFallbackT = fallback_to_none,
      typename SeverityFallbackT = fallback_to_none,
      typename ChannelOrderT = less,
      typename SeverityCompareT = greater_equal,
      typename AllocatorT = std::allocator< void >
  >
  class channel_severity_filter_terminal
  {
  public:
      //! Internal typedef for type categorization
      typedef void _is_boost_log_terminal;
  
      //! Function result type
      typedef bool result_type;
  
      //! Channel attribute value type
      typedef ChannelT channel_value_type;
      //! Channel fallback policy
      typedef ChannelFallbackT channel_fallback_policy;
      //! Severity level attribute value type
      typedef SeverityT severity_value_type;
      //! Severity level fallback policy
      typedef SeverityFallbackT severity_fallback_policy;
  
  private:
      //! Channel to severity mapping type
      typedef std::map<
          channel_value_type,
          severity_value_type,
          ChannelOrderT,
          typename AllocatorT::BOOST_NESTED_TEMPLATE rebind< std::pair< const channel_value_type, severity_value_type > >::other
      > mapping_type;
      //! Attribute value visitor invoker for channel
      typedef value_visitor_invoker< channel_value_type, channel_fallback_policy > channel_visitor_invoker_type;
      //! Attribute value visitor invoker for severity level
      typedef value_visitor_invoker< severity_value_type, severity_fallback_policy > severity_visitor_invoker_type;
  
      //! Channel visitor
      template< typename ArgT >
      struct channel_visitor
      {
          typedef void result_type;
  
          channel_visitor(channel_severity_filter_terminal const& self, ArgT arg, bool& res) : m_self(self), m_arg(arg), m_res(res)
          {
          }
  
          result_type operator() (channel_value_type const& channel) const
          {
              m_self.visit_channel(channel, m_arg, m_res);
          }
  
      private:
          channel_severity_filter_terminal const& m_self;
          ArgT m_arg;
          bool& m_res;
      };
  
      //! Severity level visitor
      struct severity_visitor
      {
          typedef void result_type;
  
          severity_visitor(channel_severity_filter_terminal const& self, severity_value_type const& severity, bool& res) : m_self(self), m_severity(severity), m_res(res)
          {
          }
  
          result_type operator() (severity_value_type const& severity) const
          {
              m_self.visit_severity(severity, m_severity, m_res);
          }
  
      private:
          channel_severity_filter_terminal const& m_self;
          severity_value_type const& m_severity;
          bool& m_res;
      };
  
  private:
      //! Channel attribute name
      attribute_name m_channel_name;
      //! Severity level attribute name
      attribute_name m_severity_name;
      //! Channel value visitor invoker
      channel_visitor_invoker_type m_channel_visitor_invoker;
      //! Severity level value visitor invoker
      severity_visitor_invoker_type m_severity_visitor_invoker;
  
      //! Channel to severity level mapping
      mapping_type m_mapping;
      //! Severity checking predicate
      SeverityCompareT m_severity_compare;
  
      //! Default result
      bool m_default;
  
  public:
      //! Initializing constructor
      channel_severity_filter_terminal
      (
          attribute_name const& channel_name,
          attribute_name const& severity_name,
          channel_fallback_policy const& channel_fallback = channel_fallback_policy(),
          severity_fallback_policy const& severity_fallback = severity_fallback_policy(),
          ChannelOrderT const& channel_order = ChannelOrderT(),
          SeverityCompareT const& severity_compare = SeverityCompareT()
      ) :
          m_channel_name(channel_name),
          m_severity_name(severity_name),
          m_channel_visitor_invoker(channel_fallback),
          m_severity_visitor_invoker(severity_fallback),
          m_mapping(channel_order),
          m_severity_compare(severity_compare),
          m_default(false)
      {
      }
  
      //! Adds a new element to the mapping
      void add(channel_value_type const& channel, severity_value_type const& severity)
      {
          typedef typename mapping_type::iterator iterator;
          std::pair< iterator, bool > res = m_mapping.insert(typename mapping_type::value_type(channel, severity));
          if (!res.second)
              res.first->second = severity;
      }
  
      //! Sets the default result of the predicate
      void set_default(bool def)
      {
          m_default = def;
      }
  
      //! Invokation operator
      template< typename ContextT >
      result_type operator() (ContextT const& ctx) const
      {
          result_type res = m_default;
  
          typedef typename remove_cv<
              typename remove_reference< typename phoenix::result_of::env< ContextT >::type >::type
          >::type env_type;
          typedef typename env_type::args_type args_type;
          typedef typename fusion::result_of::at_c< args_type, 0 >::type arg_type;
          arg_type arg = fusion::at_c< 0 >(phoenix::env(ctx).args());
  
          m_channel_visitor_invoker(m_channel_name, arg, channel_visitor< arg_type >(*this, arg, res));
  
          return res;
      }
  
  private:
      //! Visits channel name
      template< typename ArgT >
      void visit_channel(channel_value_type const& channel, ArgT const& arg, bool& res) const
      {
          typename mapping_type::const_iterator it = m_mapping.find(channel);
          if (it != m_mapping.end())
          {
              m_severity_visitor_invoker(m_severity_name, arg, severity_visitor(*this, it->second, res));
          }
      }
  
      //! Visits severity level
      void visit_severity(severity_value_type const& left, severity_value_type const& right, bool& res) const
      {
          res = m_severity_compare(left, right);
      }
  };
  
  template<
      typename ChannelT,
      typename SeverityT,
      typename ChannelFallbackT = fallback_to_none,
      typename SeverityFallbackT = fallback_to_none,
      typename ChannelOrderT = less,
      typename SeverityCompareT = greater_equal,
      typename AllocatorT = std::allocator< void >,
      template< typename > class ActorT = phoenix::actor
  >
  class channel_severity_filter_actor :
      public ActorT< channel_severity_filter_terminal< ChannelT, SeverityT, ChannelFallbackT, SeverityFallbackT, ChannelOrderT, SeverityCompareT, AllocatorT > >
  {
  private:
      //! Self type
      typedef channel_severity_filter_actor this_type;
  
  public:
      //! Terminal type
      typedef channel_severity_filter_terminal< ChannelT, SeverityT, ChannelFallbackT, SeverityFallbackT, ChannelOrderT, SeverityCompareT, AllocatorT > terminal_type;
      //! Base actor type
      typedef ActorT< terminal_type > base_type;
  
      //! Channel attribute value type
      typedef typename terminal_type::channel_value_type channel_value_type;
      //! Channel fallback policy
      typedef typename terminal_type::channel_fallback_policy channel_fallback_policy;
      //! Severity level attribute value type
      typedef typename terminal_type::severity_value_type severity_value_type;
      //! Severity level fallback policy
      typedef typename terminal_type::severity_fallback_policy severity_fallback_policy;
  
  private:
      //! An auxiliary pseudo-reference to implement insertion through subscript operator
      class subscript_result
      {
      private:
          channel_severity_filter_actor& m_owner;
          channel_value_type const& m_channel;
  
      public:
          subscript_result(channel_severity_filter_actor& owner, channel_value_type const& channel) : m_owner(owner), m_channel(channel)
          {
          }
  
          void operator= (severity_value_type const& severity)
          {
              m_owner.add(m_channel, severity);
          }
      };
  
  public:
      //! Initializing constructor
      explicit channel_severity_filter_actor(base_type const& act) : base_type(act)
      {
      }
      //! Copy constructor
      channel_severity_filter_actor(channel_severity_filter_actor const& that) : base_type(static_cast< base_type const& >(that))
      {
      }
  
      //! Sets the default function result
      this_type& set_default(bool def)
      {
          this->proto_expr_.child0.set_default(def);
          return *this;
      }
  
      //! Adds a new element to the mapping
      this_type& add(channel_value_type const& channel, severity_value_type const& severity)
      {
          this->proto_expr_.child0.add(channel, severity);
          return *this;
      }
  
      //! Alternative interface for adding a new element to the mapping
      subscript_result operator[] (channel_value_type const& channel)
      {
          return subscript_result(*this, channel);
      }
  };
  
  /*!
   * The function generates a filtering predicate that checks the severity levels of log records in different channels. The predicate will return \c true
   * if the record severity level is not less than the threshold for the channel the record belongs to.
   */
  template< typename ChannelT, typename SeverityT >
  BOOST_FORCEINLINE channel_severity_filter_actor< ChannelT, SeverityT >
  channel_severity_filter(attribute_name const& channel_name, attribute_name const& severity_name)
  {
      typedef channel_severity_filter_actor< ChannelT, SeverityT > result_type;
      typedef typename result_type::terminal_type terminal_type;
      typename result_type::base_type act = {{ terminal_type(channel_name, severity_name) }};
      return result_type(act);
  }
  
  //! \overload
  template< typename SeverityT, typename ChannelDescriptorT, template< typename > class ActorT >
  BOOST_FORCEINLINE channel_severity_filter_actor< typename ChannelDescriptorT::value_type, SeverityT, fallback_to_none, fallback_to_none, less, greater_equal, std::allocator< void >, ActorT >
  channel_severity_filter(attribute_keyword< ChannelDescriptorT, ActorT > const& channel_keyword, attribute_name const& severity_name)
  {
      typedef channel_severity_filter_actor< typename ChannelDescriptorT::value_type, SeverityT, fallback_to_none, fallback_to_none, less, greater_equal, std::allocator< void >, ActorT > result_type;
      typedef typename result_type::terminal_type terminal_type;
      typename result_type::base_type act = {{ terminal_type(channel_keyword.get_name(), severity_name) }};
      return result_type(act);
  }
  
  //! \overload
  template< typename ChannelT, typename SeverityDescriptorT, template< typename > class ActorT >
  BOOST_FORCEINLINE channel_severity_filter_actor< ChannelT, typename SeverityDescriptorT::value_type, fallback_to_none, fallback_to_none, less, greater_equal, std::allocator< void >, ActorT >
  channel_severity_filter(attribute_name const& channel_name, attribute_keyword< SeverityDescriptorT, ActorT > const& severity_keyword)
  {
      typedef channel_severity_filter_actor< ChannelT, typename SeverityDescriptorT::value_type, fallback_to_none, fallback_to_none, less, greater_equal, std::allocator< void >, ActorT > result_type;
      typedef typename result_type::terminal_type terminal_type;
      typename result_type::base_type act = {{ terminal_type(channel_name, severity_keyword.get_name()) }};
      return result_type(act);
  }
  
  //! \overload
  template< typename ChannelDescriptorT, typename SeverityDescriptorT, template< typename > class ActorT >
  BOOST_FORCEINLINE channel_severity_filter_actor< typename ChannelDescriptorT::value_type, typename SeverityDescriptorT::value_type, fallback_to_none, fallback_to_none, less, greater_equal, std::allocator< void >, ActorT >
  channel_severity_filter(attribute_keyword< ChannelDescriptorT, ActorT > const& channel_keyword, attribute_keyword< SeverityDescriptorT, ActorT > const& severity_keyword)
  {
      typedef channel_severity_filter_actor< typename ChannelDescriptorT::value_type, typename SeverityDescriptorT::value_type, fallback_to_none, fallback_to_none, less, greater_equal, std::allocator< void >, ActorT > result_type;
      typedef typename result_type::terminal_type terminal_type;
      typename result_type::base_type act = {{ terminal_type(channel_keyword.get_name(), severity_keyword.get_name()) }};
      return result_type(act);
  }
  
  //! \overload
  template< typename SeverityT, typename ChannelT, typename ChannelFallbackT, typename ChannelTagT, template< typename > class ActorT >
  BOOST_FORCEINLINE channel_severity_filter_actor< ChannelT, SeverityT, ChannelFallbackT, fallback_to_none, less, greater_equal, std::allocator< void >, ActorT >
  channel_severity_filter(attribute_actor< ChannelT, ChannelFallbackT, ChannelTagT, ActorT > const& channel_placeholder, attribute_name const& severity_name)
  {
      typedef channel_severity_filter_actor< ChannelT, SeverityT, ChannelFallbackT, fallback_to_none, less, greater_equal, std::allocator< void >, ActorT > result_type;
      typedef typename result_type::terminal_type terminal_type;
      typename result_type::base_type act = {{ terminal_type(channel_placeholder.get_name(), severity_name, channel_placeholder.get_fallback_policy()) }};
      return result_type(act);
  }
  
  //! \overload
  template< typename ChannelT, typename SeverityT, typename SeverityFallbackT, typename SeverityTagT, template< typename > class ActorT >
  BOOST_FORCEINLINE channel_severity_filter_actor< ChannelT, SeverityT, fallback_to_none, SeverityFallbackT, less, greater_equal, std::allocator< void >, ActorT >
  channel_severity_filter(attribute_name const& channel_name, attribute_actor< SeverityT, SeverityFallbackT, SeverityTagT, ActorT > const& severity_placeholder)
  {
      typedef channel_severity_filter_actor< ChannelT, SeverityT, fallback_to_none, SeverityFallbackT, less, greater_equal, std::allocator< void >, ActorT > result_type;
      typedef typename result_type::terminal_type terminal_type;
      typename result_type::base_type act = {{ terminal_type(channel_name, severity_placeholder.get_name(), fallback_to_none(), severity_placeholder.get_fallback_policy()) }};
      return result_type(act);
  }
  
  //! \overload
  template< typename ChannelT, typename ChannelFallbackT, typename ChannelTagT, typename SeverityT, typename SeverityFallbackT, typename SeverityTagT, template< typename > class ActorT >
  BOOST_FORCEINLINE channel_severity_filter_actor< ChannelT, SeverityT, ChannelFallbackT, SeverityFallbackT, less, greater_equal, std::allocator< void >, ActorT >
  channel_severity_filter(attribute_actor< ChannelT, ChannelFallbackT, ChannelTagT, ActorT > const& channel_placeholder, attribute_actor< SeverityT, SeverityFallbackT, SeverityTagT, ActorT > const& severity_placeholder)
  {
      typedef channel_severity_filter_actor< ChannelT, SeverityT, ChannelFallbackT, SeverityFallbackT, less, greater_equal, std::allocator< void >, ActorT > result_type;
      typedef typename result_type::terminal_type terminal_type;
      typename result_type::base_type act = {{ terminal_type(channel_placeholder.get_name(), severity_placeholder.get_name(), channel_placeholder.get_fallback_policy(), severity_placeholder.get_fallback_policy()) }};
      return result_type(act);
  }
  
  
  //! \overload
  template< typename ChannelT, typename SeverityT, typename SeverityCompareT >
  BOOST_FORCEINLINE channel_severity_filter_actor< ChannelT, SeverityT, fallback_to_none, fallback_to_none, less, SeverityCompareT >
  channel_severity_filter(attribute_name const& channel_name, attribute_name const& severity_name, SeverityCompareT const& severity_compare)
  {
      typedef channel_severity_filter_actor< ChannelT, SeverityT, fallback_to_none, fallback_to_none, less, SeverityCompareT > result_type;
      typedef typename result_type::terminal_type terminal_type;
      typename result_type::base_type act = {{ terminal_type(channel_name, severity_name, fallback_to_none(), fallback_to_none(), less(), severity_compare) }};
      return result_type(act);
  }
  
  //! \overload
  template< typename SeverityT, typename ChannelDescriptorT, template< typename > class ActorT, typename SeverityCompareT >
  BOOST_FORCEINLINE channel_severity_filter_actor< typename ChannelDescriptorT::value_type, SeverityT, fallback_to_none, fallback_to_none, less, SeverityCompareT, std::allocator< void >, ActorT >
  channel_severity_filter(attribute_keyword< ChannelDescriptorT, ActorT > const& channel_keyword, attribute_name const& severity_name, SeverityCompareT const& severity_compare)
  {
      typedef channel_severity_filter_actor< typename ChannelDescriptorT::value_type, SeverityT, fallback_to_none, fallback_to_none, less, SeverityCompareT, std::allocator< void >, ActorT > result_type;
      typedef typename result_type::terminal_type terminal_type;
      typename result_type::base_type act = {{ terminal_type(channel_keyword.get_name(), severity_name, fallback_to_none(), fallback_to_none(), less(), severity_compare) }};
      return result_type(act);
  }
  
  //! \overload
  template< typename ChannelT, typename SeverityDescriptorT, template< typename > class ActorT, typename SeverityCompareT >
  BOOST_FORCEINLINE channel_severity_filter_actor< ChannelT, typename SeverityDescriptorT::value_type, fallback_to_none, fallback_to_none, less, SeverityCompareT, std::allocator< void >, ActorT >
  channel_severity_filter(attribute_name const& channel_name, attribute_keyword< SeverityDescriptorT, ActorT > const& severity_keyword, SeverityCompareT const& severity_compare)
  {
      typedef channel_severity_filter_actor< ChannelT, typename SeverityDescriptorT::value_type, fallback_to_none, fallback_to_none, less, SeverityCompareT, std::allocator< void >, ActorT > result_type;
      typedef typename result_type::terminal_type terminal_type;
      typename result_type::base_type act = {{ terminal_type(channel_name, severity_keyword.get_name(), fallback_to_none(), fallback_to_none(), less(), severity_compare) }};
      return result_type(act);
  }
  
  //! \overload
  template< typename ChannelDescriptorT, typename SeverityDescriptorT, template< typename > class ActorT, typename SeverityCompareT >
  BOOST_FORCEINLINE channel_severity_filter_actor< typename ChannelDescriptorT::value_type, typename SeverityDescriptorT::value_type, fallback_to_none, fallback_to_none, less, SeverityCompareT, std::allocator< void >, ActorT >
  channel_severity_filter(attribute_keyword< ChannelDescriptorT, ActorT > const& channel_keyword, attribute_keyword< SeverityDescriptorT, ActorT > const& severity_keyword, SeverityCompareT const& severity_compare)
  {
      typedef channel_severity_filter_actor< typename ChannelDescriptorT::value_type, typename SeverityDescriptorT::value_type, fallback_to_none, fallback_to_none, less, SeverityCompareT, std::allocator< void >, ActorT > result_type;
      typedef typename result_type::terminal_type terminal_type;
      typename result_type::base_type act = {{ terminal_type(channel_keyword.get_name(), severity_keyword.get_name(), fallback_to_none(), fallback_to_none(), less(), severity_compare) }};
      return result_type(act);
  }
  
  //! \overload
  template< typename SeverityT, typename ChannelT, typename ChannelFallbackT, typename ChannelTagT, template< typename > class ActorT, typename SeverityCompareT >
  BOOST_FORCEINLINE channel_severity_filter_actor< ChannelT, SeverityT, ChannelFallbackT, fallback_to_none, less, SeverityCompareT, std::allocator< void >, ActorT >
  channel_severity_filter(attribute_actor< ChannelT, ChannelFallbackT, ChannelTagT, ActorT > const& channel_placeholder, attribute_name const& severity_name, SeverityCompareT const& severity_compare)
  {
      typedef channel_severity_filter_actor< ChannelT, SeverityT, ChannelFallbackT, fallback_to_none, less, SeverityCompareT, std::allocator< void >, ActorT > result_type;
      typedef typename result_type::terminal_type terminal_type;
      typename result_type::base_type act = {{ terminal_type(channel_placeholder.get_name(), severity_name, channel_placeholder.get_fallback_policy(), fallback_to_none(), less(), severity_compare) }};
      return result_type(act);
  }
  
  //! \overload
  template< typename ChannelT, typename SeverityT, typename SeverityFallbackT, typename SeverityTagT, template< typename > class ActorT, typename SeverityCompareT >
  BOOST_FORCEINLINE channel_severity_filter_actor< ChannelT, SeverityT, fallback_to_none, SeverityFallbackT, less, SeverityCompareT, std::allocator< void >, ActorT >
  channel_severity_filter(attribute_name const& channel_name, attribute_actor< SeverityT, SeverityFallbackT, SeverityTagT, ActorT > const& severity_placeholder, SeverityCompareT const& severity_compare)
  {
      typedef channel_severity_filter_actor< ChannelT, SeverityT, fallback_to_none, SeverityFallbackT, less, SeverityCompareT, std::allocator< void >, ActorT > result_type;
      typedef typename result_type::terminal_type terminal_type;
      typename result_type::base_type act = {{ terminal_type(channel_name, severity_placeholder.get_name(), fallback_to_none(), severity_placeholder.get_fallback_policy(), less(), severity_compare) }};
      return result_type(act);
  }
  
  //! \overload
  template< typename ChannelT, typename ChannelFallbackT, typename ChannelTagT, typename SeverityT, typename SeverityFallbackT, typename SeverityTagT, template< typename > class ActorT, typename SeverityCompareT >
  BOOST_FORCEINLINE channel_severity_filter_actor< ChannelT, SeverityT, ChannelFallbackT, SeverityFallbackT, less, SeverityCompareT, std::allocator< void >, ActorT >
  channel_severity_filter(attribute_actor< ChannelT, ChannelFallbackT, ChannelTagT, ActorT > const& channel_placeholder, attribute_actor< SeverityT, SeverityFallbackT, SeverityTagT, ActorT > const& severity_placeholder, SeverityCompareT const& severity_compare)
  {
      typedef channel_severity_filter_actor< ChannelT, SeverityT, ChannelFallbackT, SeverityFallbackT, less, SeverityCompareT, std::allocator< void >, ActorT > result_type;
      typedef typename result_type::terminal_type terminal_type;
      typename result_type::base_type act = {{ terminal_type(channel_placeholder.get_name(), severity_placeholder.get_name(), channel_placeholder.get_fallback_policy(), severity_placeholder.get_fallback_policy(), less(), severity_compare) }};
      return result_type(act);
  }
  
  
  //! \overload
  template< typename ChannelT, typename SeverityT, typename SeverityCompareT, typename ChannelOrderT >
  BOOST_FORCEINLINE channel_severity_filter_actor< ChannelT, SeverityT, fallback_to_none, fallback_to_none, ChannelOrderT, SeverityCompareT >
  channel_severity_filter(attribute_name const& channel_name, attribute_name const& severity_name, SeverityCompareT const& severity_compare, ChannelOrderT const& channel_order)
  {
      typedef channel_severity_filter_actor< ChannelT, SeverityT, fallback_to_none, fallback_to_none, ChannelOrderT, SeverityCompareT > result_type;
      typedef typename result_type::terminal_type terminal_type;
      typename result_type::base_type act = {{ terminal_type(channel_name, severity_name, fallback_to_none(), fallback_to_none(), channel_order, severity_compare) }};
      return result_type(act);
  }
  
  //! \overload
  template< typename SeverityT, typename ChannelDescriptorT, template< typename > class ActorT, typename SeverityCompareT, typename ChannelOrderT >
  BOOST_FORCEINLINE channel_severity_filter_actor< typename ChannelDescriptorT::value_type, SeverityT, fallback_to_none, fallback_to_none, ChannelOrderT, SeverityCompareT, std::allocator< void >, ActorT >
  channel_severity_filter(attribute_keyword< ChannelDescriptorT, ActorT > const& channel_keyword, attribute_name const& severity_name, SeverityCompareT const& severity_compare, ChannelOrderT const& channel_order)
  {
      typedef channel_severity_filter_actor< typename ChannelDescriptorT::value_type, SeverityT, fallback_to_none, fallback_to_none, ChannelOrderT, SeverityCompareT, std::allocator< void >, ActorT > result_type;
      typedef typename result_type::terminal_type terminal_type;
      typename result_type::base_type act = {{ terminal_type(channel_keyword.get_name(), severity_name, fallback_to_none(), fallback_to_none(), channel_order, severity_compare) }};
      return result_type(act);
  }
  
  //! \overload
  template< typename ChannelT, typename SeverityDescriptorT, template< typename > class ActorT, typename SeverityCompareT, typename ChannelOrderT >
  BOOST_FORCEINLINE channel_severity_filter_actor< ChannelT, typename SeverityDescriptorT::value_type, fallback_to_none, fallback_to_none, ChannelOrderT, SeverityCompareT, std::allocator< void >, ActorT >
  channel_severity_filter(attribute_name const& channel_name, attribute_keyword< SeverityDescriptorT, ActorT > const& severity_keyword, SeverityCompareT const& severity_compare, ChannelOrderT const& channel_order)
  {
      typedef channel_severity_filter_actor< ChannelT, typename SeverityDescriptorT::value_type, fallback_to_none, fallback_to_none, ChannelOrderT, SeverityCompareT, std::allocator< void >, ActorT > result_type;
      typedef typename result_type::terminal_type terminal_type;
      typename result_type::base_type act = {{ terminal_type(channel_name, severity_keyword.get_name(), fallback_to_none(), fallback_to_none(), channel_order, severity_compare) }};
      return result_type(act);
  }
  
  //! \overload
  template< typename ChannelDescriptorT, typename SeverityDescriptorT, template< typename > class ActorT, typename SeverityCompareT, typename ChannelOrderT >
  BOOST_FORCEINLINE channel_severity_filter_actor< typename ChannelDescriptorT::value_type, typename SeverityDescriptorT::value_type, fallback_to_none, fallback_to_none, ChannelOrderT, SeverityCompareT, std::allocator< void >, ActorT >
  channel_severity_filter(attribute_keyword< ChannelDescriptorT, ActorT > const& channel_keyword, attribute_keyword< SeverityDescriptorT, ActorT > const& severity_keyword, SeverityCompareT const& severity_compare, ChannelOrderT const& channel_order)
  {
      typedef channel_severity_filter_actor< typename ChannelDescriptorT::value_type, typename SeverityDescriptorT::value_type, fallback_to_none, fallback_to_none, ChannelOrderT, SeverityCompareT, std::allocator< void >, ActorT > result_type;
      typedef typename result_type::terminal_type terminal_type;
      typename result_type::base_type act = {{ terminal_type(channel_keyword.get_name(), severity_keyword.get_name(), fallback_to_none(), fallback_to_none(), channel_order, severity_compare) }};
      return result_type(act);
  }
  
  //! \overload
  template< typename SeverityT, typename ChannelT, typename ChannelFallbackT, typename ChannelTagT, template< typename > class ActorT, typename SeverityCompareT, typename ChannelOrderT >
  BOOST_FORCEINLINE channel_severity_filter_actor< ChannelT, SeverityT, ChannelFallbackT, fallback_to_none, ChannelOrderT, SeverityCompareT, std::allocator< void >, ActorT >
  channel_severity_filter(attribute_actor< ChannelT, ChannelFallbackT, ChannelTagT, ActorT > const& channel_placeholder, attribute_name const& severity_name, SeverityCompareT const& severity_compare, ChannelOrderT const& channel_order)
  {
      typedef channel_severity_filter_actor< ChannelT, SeverityT, ChannelFallbackT, fallback_to_none, ChannelOrderT, SeverityCompareT, std::allocator< void >, ActorT > result_type;
      typedef typename result_type::terminal_type terminal_type;
      typename result_type::base_type act = {{ terminal_type(channel_placeholder.get_name(), severity_name, channel_placeholder.get_fallback_policy(), fallback_to_none(), channel_order, severity_compare) }};
      return result_type(act);
  }
  
  //! \overload
  template< typename ChannelT, typename SeverityT, typename SeverityFallbackT, typename SeverityTagT, template< typename > class ActorT, typename SeverityCompareT, typename ChannelOrderT >
  BOOST_FORCEINLINE channel_severity_filter_actor< ChannelT, SeverityT, fallback_to_none, SeverityFallbackT, ChannelOrderT, SeverityCompareT, std::allocator< void >, ActorT >
  channel_severity_filter(attribute_name const& channel_name, attribute_actor< SeverityT, SeverityFallbackT, SeverityTagT, ActorT > const& severity_placeholder, SeverityCompareT const& severity_compare, ChannelOrderT const& channel_order)
  {
      typedef channel_severity_filter_actor< ChannelT, SeverityT, fallback_to_none, SeverityFallbackT, ChannelOrderT, SeverityCompareT, std::allocator< void >, ActorT > result_type;
      typedef typename result_type::terminal_type terminal_type;
      typename result_type::base_type act = {{ terminal_type(channel_name, severity_placeholder.get_name(), fallback_to_none(), severity_placeholder.get_fallback_policy(), channel_order, severity_compare) }};
      return result_type(act);
  }
  
  //! \overload
  template< typename ChannelT, typename ChannelFallbackT, typename ChannelTagT, typename SeverityT, typename SeverityFallbackT, typename SeverityTagT, template< typename > class ActorT, typename SeverityCompareT, typename ChannelOrderT >
  BOOST_FORCEINLINE channel_severity_filter_actor< ChannelT, SeverityT, ChannelFallbackT, SeverityFallbackT, ChannelOrderT, SeverityCompareT, std::allocator< void >, ActorT >
  channel_severity_filter(attribute_actor< ChannelT, ChannelFallbackT, ChannelTagT, ActorT > const& channel_placeholder, attribute_actor< SeverityT, SeverityFallbackT, SeverityTagT, ActorT > const& severity_placeholder, SeverityCompareT const& severity_compare, ChannelOrderT const& channel_order)
  {
      typedef channel_severity_filter_actor< ChannelT, SeverityT, ChannelFallbackT, SeverityFallbackT, ChannelOrderT, SeverityCompareT, std::allocator< void >, ActorT > result_type;
      typedef typename result_type::terminal_type terminal_type;
      typename result_type::base_type act = {{ terminal_type(channel_placeholder.get_name(), severity_placeholder.get_name(), channel_placeholder.get_fallback_policy(), severity_placeholder.get_fallback_policy(), channel_order, severity_compare) }};
      return result_type(act);
  }
  
  } // namespace expressions
  
  BOOST_LOG_CLOSE_NAMESPACE // namespace log
  
  #ifndef BOOST_LOG_DOXYGEN_PASS
  
  namespace phoenix {
  
  namespace result_of {
  
  template<
      typename ChannelT,
      typename SeverityT,
      typename ChannelFallbackT,
      typename SeverityFallbackT,
      typename ChannelOrderT,
      typename SeverityCompareT,
      typename AllocatorT
  >
  struct is_nullary< custom_terminal< boost::log::expressions::channel_severity_filter_terminal< ChannelT, SeverityT, ChannelFallbackT, SeverityFallbackT, ChannelOrderT, SeverityCompareT, AllocatorT > > > :
      public mpl::false_
  {
  };
  
  } // namespace result_of
  
  } // namespace phoenix
  
  #endif
  
  } // namespace boost
  
  #include <boost/log/detail/footer.hpp>
  
  #endif // BOOST_LOG_EXPRESSIONS_PREDICATES_CHANNEL_SEVERITY_FILTER_HPP_INCLUDED_
  