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 /*
  *          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   basic_logger.hpp
  * \author Andrey Semashev
  * \date   08.03.2007
  *
  * The header contains implementation of a base class for loggers. Convenience macros
  * for defining custom loggers are also provided.
  */
 
 #ifndef BOOST_LOG_SOURCES_BASIC_LOGGER_HPP_INCLUDED_
 #define BOOST_LOG_SOURCES_BASIC_LOGGER_HPP_INCLUDED_
 
 #include <exception>
 #include <utility>
 #include <ostream>
 #include <boost/assert.hpp>
 #include <boost/move/core.hpp>
 #include <boost/move/utility_core.hpp>
 #include <boost/core/addressof.hpp>
 #include <boost/type_traits/is_nothrow_swappable.hpp>
 #include <boost/type_traits/is_nothrow_move_constructible.hpp>
 #include <boost/preprocessor/facilities/empty.hpp>
 #include <boost/preprocessor/facilities/identity.hpp>
 #include <boost/preprocessor/seq/enum.hpp>
 #include <boost/log/detail/config.hpp>
 #include <boost/log/detail/parameter_tools.hpp>
 #include <boost/log/attributes/attribute_set.hpp>
 #include <boost/log/attributes/attribute_name.hpp>
 #include <boost/log/attributes/attribute.hpp>
 #include <boost/log/core/core.hpp>
 #include <boost/log/core/record.hpp>
 #include <boost/log/sources/features.hpp>
 #include <boost/log/sources/threading_models.hpp>
 #include <boost/log/detail/header.hpp>
 
 #ifdef BOOST_HAS_PRAGMA_ONCE
 #pragma once
 #endif
 
 namespace boost {
 
 BOOST_LOG_OPEN_NAMESPACE
 
 namespace sources {
 
 /*!
  * \brief Basic logger class
  *
  * The \c basic_logger class template serves as a base class for all loggers
  * provided by the library. It can also be used as a base for user-defined
  * loggers. The template parameters are:
  *
  * \li \c CharT - logging character type
  * \li \c FinalT - final type of the logger that eventually derives from
  *     the \c basic_logger. There may be other classes in the hierarchy
  *     between the final class and \c basic_logger.
  * \li \c ThreadingModelT - threading model policy. Must provide methods
  *     of the Boost.Thread locking concept used in \c basic_logger class
  *     and all its derivatives in the hierarchy up to the \c FinalT class.
  *     The \c basic_logger class itself requires methods of the
  *     SharedLockable concept. The threading model policy must also be
  *     default and copy-constructible and support member function \c swap.
  *     There are currently two policies provided: \c single_thread_model
  *     and \c multi_thread_model.
  *
  * The logger implements fundamental facilities of loggers, such as storing
  * source-specific attribute set and formatting log record messages. The basic
  * logger interacts with the logging core in order to apply filtering and
  * pass records to sinks.
  */
 template< typename CharT, typename FinalT, typename ThreadingModelT >
 class basic_logger :
     public ThreadingModelT
 {
     typedef basic_logger this_type;
     BOOST_COPYABLE_AND_MOVABLE_ALT(this_type)
 
 public:
     //! Character type
     typedef CharT char_type;
     //! Final logger type
     typedef FinalT final_type;
     //! Threading model type
     typedef ThreadingModelT threading_model;
 
 #if !defined(BOOST_LOG_NO_THREADS)
     //! Lock requirement for the swap_unlocked method
     typedef boost::log::aux::multiple_unique_lock2< threading_model, threading_model > swap_lock;
     //! Lock requirement for the add_attribute_unlocked method
     typedef boost::log::aux::exclusive_lock_guard< threading_model > add_attribute_lock;
     //! Lock requirement for the remove_attribute_unlocked method
     typedef boost::log::aux::exclusive_lock_guard< threading_model > remove_attribute_lock;
     //! Lock requirement for the remove_all_attributes_unlocked method
     typedef boost::log::aux::exclusive_lock_guard< threading_model > remove_all_attributes_lock;
     //! Lock requirement for the get_attributes method
     typedef boost::log::aux::shared_lock_guard< const threading_model > get_attributes_lock;
     //! Lock requirement for the open_record_unlocked method
     typedef boost::log::aux::shared_lock_guard< threading_model > open_record_lock;
     //! Lock requirement for the set_attributes method
     typedef boost::log::aux::exclusive_lock_guard< threading_model > set_attributes_lock;
 #else
     typedef no_lock< threading_model > swap_lock;
     typedef no_lock< threading_model > add_attribute_lock;
     typedef no_lock< threading_model > remove_attribute_lock;
     typedef no_lock< threading_model > remove_all_attributes_lock;
     typedef no_lock< const threading_model > get_attributes_lock;
     typedef no_lock< threading_model > open_record_lock;
     typedef no_lock< threading_model > set_attributes_lock;
 #endif
 
     //! Lock requirement for the push_record_unlocked method
     typedef no_lock< threading_model > push_record_lock;
 
 private:
     //! A pointer to the logging system
     core_ptr m_pCore;
 
     //! Logger-specific attribute set
     attribute_set m_Attributes;
 
 public:
     /*!
      * Constructor. Initializes internal data structures of the basic logger class,
      * acquires reference to the logging core.
      */
     basic_logger() :
         threading_model(),
         m_pCore(core::get())
     {
     }
     /*!
      * Copy constructor. Copies all attributes from the source logger.
      *
      * \note Not thread-safe. The source logger must be locked in the final class before copying.
      *
      * \param that Source logger
      */
     basic_logger(basic_logger const& that) :
         threading_model(static_cast< threading_model const& >(that)),
         m_pCore(that.m_pCore),
         m_Attributes(that.m_Attributes)
     {
     }
     /*!
      * Move constructor. Moves all attributes from the source logger.
      *
      * \note Not thread-safe. The source logger must be locked in the final class before copying.
      *
      * \param that Source logger
      */
     basic_logger(BOOST_RV_REF(basic_logger) that) BOOST_NOEXCEPT_IF(boost::is_nothrow_move_constructible< threading_model >::value &&
                                                                     boost::is_nothrow_move_constructible< core_ptr >::value &&
                                                                     boost::is_nothrow_move_constructible< attribute_set >::value) :
         threading_model(boost::move(static_cast< threading_model& >(that))),
         m_pCore(boost::move(that.m_pCore)),
         m_Attributes(boost::move(that.m_Attributes))
     {
     }
     /*!
      * Constructor with named arguments. The constructor ignores all arguments. The result of
      * construction is equivalent to default construction.
      */
     template< typename ArgsT >
     explicit basic_logger(ArgsT const&) :
         threading_model(),
         m_pCore(core::get())
     {
     }
 
 protected:
     /*!
      * An accessor to the logging system pointer
      */
     core_ptr const& core() const { return m_pCore; }
     /*!
      * An accessor to the logger attributes
      */
     attribute_set& attributes() { return m_Attributes; }
     /*!
      * An accessor to the logger attributes
      */
     attribute_set const& attributes() const { return m_Attributes; }
     /*!
      * An accessor to the threading model base
      */
     threading_model& get_threading_model() BOOST_NOEXCEPT { return *this; }
     /*!
      * An accessor to the threading model base
      */
     threading_model const& get_threading_model() const BOOST_NOEXCEPT { return *this; }
     /*!
      * An accessor to the final logger
      */
     final_type* final_this() BOOST_NOEXCEPT
     {
         BOOST_LOG_ASSUME(this != NULL);
         return static_cast< final_type* >(this);
     }
     /*!
      * An accessor to the final logger
      */
     final_type const* final_this() const BOOST_NOEXCEPT
     {
         BOOST_LOG_ASSUME(this != NULL);
         return static_cast< final_type const* >(this);
     }
 
     /*!
      * Unlocked \c swap
      */
     void swap_unlocked(basic_logger& that)
     {
         get_threading_model().swap(that.get_threading_model());
         m_Attributes.swap(that.m_Attributes);
     }
 
     /*!
      * Unlocked \c add_attribute
      */
     std::pair< attribute_set::iterator, bool > add_attribute_unlocked(attribute_name const& name, attribute const& attr)
     {
         return m_Attributes.insert(name, attr);
     }
 
     /*!
      * Unlocked \c remove_attribute
      */
     void remove_attribute_unlocked(attribute_set::iterator it)
     {
         m_Attributes.erase(it);
     }
 
     /*!
      * Unlocked \c remove_all_attributes
      */
     void remove_all_attributes_unlocked()
     {
         m_Attributes.clear();
     }
 
     /*!
      * Unlocked \c open_record
      */
     record open_record_unlocked()
     {
         return m_pCore->open_record(m_Attributes);
     }
     /*!
      * Unlocked \c open_record
      */
     template< typename ArgsT >
     record open_record_unlocked(ArgsT const&)
     {
         return m_pCore->open_record(m_Attributes);
     }
 
     /*!
      * Unlocked \c push_record
      */
     void push_record_unlocked(BOOST_RV_REF(record) rec)
     {
         m_pCore->push_record(boost::move(rec));
     }
 
     /*!
      * Unlocked \c get_attributes
      */
     attribute_set get_attributes_unlocked() const
     {
         return m_Attributes;
     }
 
     /*!
      * Unlocked \c set_attributes
      */
     void set_attributes_unlocked(attribute_set const& attrs)
     {
         m_Attributes = attrs;
     }
 
     //! Assignment is closed (should be implemented through copy and swap in the final class)
     BOOST_DELETED_FUNCTION(basic_logger& operator= (basic_logger const&))
 };
 
 /*!
  * Free-standing swap for all loggers
  */
 template< typename CharT, typename FinalT, typename ThreadingModelT >
 inline void swap(
     basic_logger< CharT, FinalT, ThreadingModelT >& left,
     basic_logger< CharT, FinalT, ThreadingModelT >& right) BOOST_NOEXCEPT_IF(boost::is_nothrow_swappable< FinalT >::value)
 {
     static_cast< FinalT& >(left).swap(static_cast< FinalT& >(right));
 }
 
 /*!
  * \brief A composite logger that inherits a number of features
  *
  * The composite logger is a helper class that simplifies feature composition into the final logger.
  * The user's logger class is expected to derive from the composite logger class, instantiated with
  * the character type, the user's logger class, the threading model and the list of the required features.
  * The former three parameters are passed to the \c basic_logger class template. The feature list
  * must be an MPL type sequence, where each element is a unary MPL metafunction class, that upon
  * applying on its argument results in a logging feature class that derives from the argument.
  * Every logger feature provided by the library can participate in the feature list.
  */
 template< typename CharT, typename FinalT, typename ThreadingModelT, typename FeaturesT >
 class basic_composite_logger :
     public boost::log::sources::aux::inherit_features<
         basic_logger< CharT, FinalT, ThreadingModelT >,
         FeaturesT
     >::type
 {
 private:
     //! Base type (the hierarchy of features)
     typedef typename boost::log::sources::aux::inherit_features<
         basic_logger< CharT, FinalT, ThreadingModelT >,
         FeaturesT
     >::type base_type;
 
 protected:
     //! The composite logger type (for use in the user's logger class)
     typedef basic_composite_logger logger_base;
     BOOST_COPYABLE_AND_MOVABLE_ALT(logger_base)
 
 public:
     //! Threading model being used
     typedef typename base_type::threading_model threading_model;
 
     //! Lock requirement for the swap_unlocked method
     typedef typename base_type::swap_lock swap_lock;
 
 #if !defined(BOOST_LOG_NO_THREADS)
 
 public:
     /*!
      * Default constructor (default-constructs all features)
      */
     basic_composite_logger() {}
     /*!
      * Copy constructor
      */
     basic_composite_logger(basic_composite_logger const& that) :
         base_type
         ((
             boost::log::aux::shared_lock_guard< const threading_model >(that.get_threading_model()),
             static_cast< base_type const& >(that)
         ))
     {
     }
     /*!
      * Move constructor
      */
     basic_composite_logger(BOOST_RV_REF(logger_base) that) BOOST_NOEXCEPT_IF(boost::is_nothrow_move_constructible< base_type >::value) :
         base_type(boost::move(static_cast< base_type& >(that)))
     {
     }
     /*!
      * Constructor with named parameters
      */
     template< typename ArgsT >
     explicit basic_composite_logger(ArgsT const& args) : base_type(args)
     {
     }
 
     /*!
      * The method adds an attribute to the source-specific attribute set. The attribute will be implicitly added to
      * every log record made with the current logger.
      *
      * \param name The attribute name.
      * \param attr The attribute factory.
      * \return A pair of values. If the second member is \c true, then the attribute is added and the first member points to the
      *         attribute. Otherwise the attribute was not added and the first member points to the attribute that prevents
      *         addition.
      */
     std::pair< attribute_set::iterator, bool > add_attribute(attribute_name const& name, attribute const& attr)
     {
         typename base_type::add_attribute_lock lock(base_type::get_threading_model());
         return base_type::add_attribute_unlocked(name, attr);
     }
     /*!
      * The method removes an attribute from the source-specific attribute set.
      *
      * \pre The attribute was added with the add_attribute call for this instance of the logger.
      * \post The attribute is no longer registered as a source-specific attribute for this logger. The iterator is invalidated after removal.
      *
      * \param it Iterator to the previously added attribute.
      */
     void remove_attribute(attribute_set::iterator it)
     {
         typename base_type::remove_attribute_lock lock(base_type::get_threading_model());
         base_type::remove_attribute_unlocked(it);
     }
 
     /*!
      * The method removes all attributes from the logger. All iterators and references to the removed attributes are invalidated.
      */
     void remove_all_attributes()
     {
         typename base_type::remove_all_attributes_lock lock(base_type::get_threading_model());
         base_type::remove_all_attributes_unlocked();
     }
 
     /*!
      * The method retrieves a copy of a set with all attributes from the logger.
      *
      * \return The copy of the attribute set. Attributes are shallow-copied.
      */
     attribute_set get_attributes() const
     {
         typename base_type::get_attributes_lock lock(base_type::get_threading_model());
         return base_type::get_attributes_unlocked();
     }
 
     /*!
      * The method installs the whole attribute set into the logger. All iterators and references to elements of
      * the previous set are invalidated. Iterators to the \a attrs set are not valid to be used with the logger (that is,
      * the logger owns a copy of \a attrs after completion).
      *
      * \param attrs The set of attributes to install into the logger. Attributes are shallow-copied.
      */
     void set_attributes(attribute_set const& attrs)
     {
         typename base_type::set_attributes_lock lock(base_type::get_threading_model());
         base_type::set_attributes_unlocked(attrs);
     }
 
     /*!
      * The method opens a new log record in the logging core.
      *
      * \return A valid record handle if the logging record is opened successfully, an invalid handle otherwise.
      */
     record open_record()
     {
         // Perform a quick check first
         if (this->core()->get_logging_enabled())
         {
             typename base_type::open_record_lock lock(base_type::get_threading_model());
             return base_type::open_record_unlocked(boost::log::aux::empty_arg_list());
         }
         else
             return record();
     }
     /*!
      * The method opens a new log record in the logging core.
      *
      * \param args A set of additional named arguments. The parameter is ignored.
      * \return A valid record handle if the logging record is opened successfully, an invalid handle otherwise.
      */
     template< typename ArgsT >
     record open_record(ArgsT const& args)
     {
         // Perform a quick check first
         if (this->core()->get_logging_enabled())
         {
             typename base_type::open_record_lock lock(base_type::get_threading_model());
             return base_type::open_record_unlocked(args);
         }
         else
             return record();
     }
     /*!
      * The method pushes the constructed message to the logging core
      *
      * \param rec The log record with the formatted message
      */
     void push_record(BOOST_RV_REF(record) rec)
     {
         typename base_type::push_record_lock lock(base_type::get_threading_model());
         base_type::push_record_unlocked(boost::move(rec));
     }
     /*!
      * Thread-safe implementation of swap
      */
     void swap(basic_composite_logger& that)
     {
         swap_lock lock(base_type::get_threading_model(), that.get_threading_model());
         base_type::swap_unlocked(static_cast< base_type& >(that));
     }
 
 protected:
     /*!
      * Assignment for the final class. Threadsafe, provides strong exception guarantee.
      */
     FinalT& assign(FinalT const& that)
     {
         BOOST_LOG_ASSUME(this != NULL);
         if (static_cast< FinalT* >(this) != boost::addressof(that))
         {
             // We'll have to explicitly create the copy in order to make sure it's unlocked when we attempt to lock *this
             FinalT tmp(that);
             boost::log::aux::exclusive_lock_guard< threading_model > lock(base_type::get_threading_model());
             base_type::swap_unlocked(tmp);
         }
         return static_cast< FinalT& >(*this);
     }
 };
 
 //! An optimized composite logger version with no multithreading support
 template< typename CharT, typename FinalT, typename FeaturesT >
 class basic_composite_logger< CharT, FinalT, single_thread_model, FeaturesT > :
     public boost::log::sources::aux::inherit_features<
         basic_logger< CharT, FinalT, single_thread_model >,
         FeaturesT
     >::type
 {
 private:
     typedef typename boost::log::sources::aux::inherit_features<
         basic_logger< CharT, FinalT, single_thread_model >,
         FeaturesT
     >::type base_type;
 
 protected:
     typedef basic_composite_logger logger_base;
     BOOST_COPYABLE_AND_MOVABLE_ALT(logger_base)
 
 public:
     typedef typename base_type::threading_model threading_model;
 
 #endif // !defined(BOOST_LOG_NO_THREADS)
 
 public:
     basic_composite_logger() {}
     basic_composite_logger(basic_composite_logger const& that) :
         base_type(static_cast< base_type const& >(that))
     {
     }
     basic_composite_logger(BOOST_RV_REF(logger_base) that) BOOST_NOEXCEPT_IF(boost::is_nothrow_move_constructible< base_type >::value) :
         base_type(boost::move(static_cast< base_type& >(that)))
     {
     }
     template< typename ArgsT >
     explicit basic_composite_logger(ArgsT const& args) : base_type(args)
     {
     }
 
     std::pair< attribute_set::iterator, bool > add_attribute(attribute_name const& name, attribute const& attr)
     {
         return base_type::add_attribute_unlocked(name, attr);
     }
     void remove_attribute(attribute_set::iterator it)
     {
         base_type::remove_attribute_unlocked(it);
     }
     void remove_all_attributes()
     {
         base_type::remove_all_attributes_unlocked();
     }
     attribute_set get_attributes() const
     {
         return base_type::get_attributes_unlocked();
     }
     void set_attributes(attribute_set const& attrs)
     {
         base_type::set_attributes_unlocked(attrs);
     }
     record open_record()
     {
         // Perform a quick check first
         if (this->core()->get_logging_enabled())
             return base_type::open_record_unlocked(boost::log::aux::empty_arg_list());
         else
             return record();
     }
     template< typename ArgsT >
     record open_record(ArgsT const& args)
     {
         // Perform a quick check first
         if (this->core()->get_logging_enabled())
             return base_type::open_record_unlocked(args);
         else
             return record();
     }
     void push_record(BOOST_RV_REF(record) rec)
     {
         base_type::push_record_unlocked(boost::move(rec));
     }
     void swap(basic_composite_logger& that)
     {
         base_type::swap_unlocked(static_cast< base_type& >(that));
     }
 
 protected:
     FinalT& assign(FinalT that)
     {
         base_type::swap_unlocked(that);
         return static_cast< FinalT& >(*this);
     }
 };
 
 
 #ifndef BOOST_LOG_DOXYGEN_PASS
 
 #define BOOST_LOG_FORWARD_LOGGER_CONSTRUCTORS_IMPL(class_type, typename_keyword)\
     public:\
         BOOST_DEFAULTED_FUNCTION(class_type(), {})\
         class_type(class_type const& that) : class_type::logger_base(\
             static_cast< typename_keyword() class_type::logger_base const& >(that)) {}\
         class_type(BOOST_RV_REF(class_type) that) BOOST_NOEXCEPT_IF(boost::is_nothrow_move_constructible< typename_keyword() class_type::logger_base >::value) : class_type::logger_base(\
             ::boost::move(static_cast< typename_keyword() class_type::logger_base& >(that))) {}\
         BOOST_LOG_PARAMETRIZED_CONSTRUCTORS_FORWARD(class_type, class_type::logger_base)\
 
 #endif // BOOST_LOG_DOXYGEN_PASS
 
 #define BOOST_LOG_FORWARD_LOGGER_CONSTRUCTORS(class_type)\
     BOOST_LOG_FORWARD_LOGGER_CONSTRUCTORS_IMPL(class_type, BOOST_PP_EMPTY)
 
 #define BOOST_LOG_FORWARD_LOGGER_CONSTRUCTORS_TEMPLATE(class_type)\
     BOOST_LOG_FORWARD_LOGGER_CONSTRUCTORS_IMPL(class_type, BOOST_PP_IDENTITY(typename))
 
 #define BOOST_LOG_FORWARD_LOGGER_ASSIGNMENT(class_type)\
     public:\
         class_type& operator= (BOOST_COPY_ASSIGN_REF(class_type) that)\
         {\
             return class_type::logger_base::assign(static_cast< class_type const& >(that));\
         }\
         class_type& operator= (BOOST_RV_REF(class_type) that)\
         {\
             BOOST_LOG_EXPR_IF_MT(::boost::log::aux::exclusive_lock_guard< class_type::threading_model > lock(this->get_threading_model());)\
             this->swap_unlocked(that);\
             return *this;\
         }
 
 #define BOOST_LOG_FORWARD_LOGGER_ASSIGNMENT_TEMPLATE(class_type)\
     public:\
         class_type& operator= (BOOST_COPY_ASSIGN_REF(class_type) that)\
         {\
             return class_type::logger_base::assign(static_cast< class_type const& >(that));\
         }\
         class_type& operator= (BOOST_RV_REF(class_type) that)\
         {\
             BOOST_LOG_EXPR_IF_MT(::boost::log::aux::exclusive_lock_guard< typename class_type::threading_model > lock(this->get_threading_model());)\
             this->swap_unlocked(that);\
             return *this;\
         }
 
 #define BOOST_LOG_FORWARD_LOGGER_MEMBERS(class_type)\
     BOOST_COPYABLE_AND_MOVABLE(class_type)\
     BOOST_LOG_FORWARD_LOGGER_CONSTRUCTORS(class_type)\
     BOOST_LOG_FORWARD_LOGGER_ASSIGNMENT(class_type)
 
 #define BOOST_LOG_FORWARD_LOGGER_MEMBERS_TEMPLATE(class_type)\
     BOOST_COPYABLE_AND_MOVABLE(class_type)\
     BOOST_LOG_FORWARD_LOGGER_CONSTRUCTORS_TEMPLATE(class_type)\
     BOOST_LOG_FORWARD_LOGGER_ASSIGNMENT_TEMPLATE(class_type)
 
 } // namespace sources
 
 BOOST_LOG_CLOSE_NAMESPACE // namespace log
 
 } // namespace boost
 
 /*!
  *  \brief The macro declares a logger class that inherits a number of base classes
  *
  *  \param type_name The name of the logger class to declare
  *  \param char_type The character type of the logger. Either char or wchar_t expected.
  *  \param base_seq A Boost.Preprocessor sequence of type identifiers of the base classes templates
  *  \param threading A threading model class
  */
 #define BOOST_LOG_DECLARE_LOGGER_TYPE(type_name, char_type, base_seq, threading)\
     class type_name :\
         public ::boost::log::sources::basic_composite_logger<\
             char_type,\
             type_name,\
             threading,\
             ::boost::log::sources::features< BOOST_PP_SEQ_ENUM(base_seq) >\
         >\
     {\
         BOOST_LOG_FORWARD_LOGGER_MEMBERS(type_name)\
     }
 
 
 
 #ifdef BOOST_LOG_USE_CHAR
 
 /*!
  *  \brief The macro declares a narrow-char logger class that inherits a number of base classes
  *
  *  Equivalent to BOOST_LOG_DECLARE_LOGGER_TYPE(type_name, char, base_seq, single_thread_model)
  *
  *  \param type_name The name of the logger class to declare
  *  \param base_seq A Boost.Preprocessor sequence of type identifiers of the base classes templates
  */
 #define BOOST_LOG_DECLARE_LOGGER(type_name, base_seq)\
     BOOST_LOG_DECLARE_LOGGER_TYPE(type_name, char, base_seq, ::boost::log::sources::single_thread_model)
 
 #if !defined(BOOST_LOG_NO_THREADS)
 
 /*!
  *  \brief The macro declares a narrow-char thread-safe logger class that inherits a number of base classes
  *
  *  Equivalent to <tt>BOOST_LOG_DECLARE_LOGGER_TYPE(type_name, char, base_seq, multi_thread_model< shared_mutex >)</tt>
  *
  *  \param type_name The name of the logger class to declare
  *  \param base_seq A Boost.Preprocessor sequence of type identifiers of the base classes templates
  */
 #define BOOST_LOG_DECLARE_LOGGER_MT(type_name, base_seq)\
     BOOST_LOG_DECLARE_LOGGER_TYPE(type_name, char, base_seq,\
         ::boost::log::sources::multi_thread_model< ::boost::shared_mutex >)
 
 #endif // !defined(BOOST_LOG_NO_THREADS)
 #endif // BOOST_LOG_USE_CHAR
 
 #ifdef BOOST_LOG_USE_WCHAR_T
 
 /*!
  *  \brief The macro declares a wide-char logger class that inherits a number of base classes
  *
  *  Equivalent to BOOST_LOG_DECLARE_LOGGER_TYPE(type_name, wchar_t, base_seq, single_thread_model)
  *
  *  \param type_name The name of the logger class to declare
  *  \param base_seq A Boost.Preprocessor sequence of type identifiers of the base classes templates
  */
 #define BOOST_LOG_DECLARE_WLOGGER(type_name, base_seq)\
     BOOST_LOG_DECLARE_LOGGER_TYPE(type_name, wchar_t, base_seq, ::boost::log::sources::single_thread_model)
 
 #if !defined(BOOST_LOG_NO_THREADS)
 
 /*!
  *  \brief The macro declares a wide-char thread-safe logger class that inherits a number of base classes
  *
  *  Equivalent to <tt>BOOST_LOG_DECLARE_LOGGER_TYPE(type_name, wchar_t, base_seq, multi_thread_model< shared_mutex >)</tt>
  *
  *  \param type_name The name of the logger class to declare
  *  \param base_seq A Boost.Preprocessor sequence of type identifiers of the base classes templates
  */
 #define BOOST_LOG_DECLARE_WLOGGER_MT(type_name, base_seq)\
     BOOST_LOG_DECLARE_LOGGER_TYPE(type_name, wchar_t, base_seq,\
         ::boost::log::sources::multi_thread_model< ::boost::shared_mutex >)
 
 #endif // !defined(BOOST_LOG_NO_THREADS)
 #endif // BOOST_LOG_USE_WCHAR_T
 
 #include <boost/log/detail/footer.hpp>
 
 #endif // BOOST_LOG_SOURCES_BASIC_LOGGER_HPP_INCLUDED_

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