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+//  boost/system/error_code.hpp  ---------------------------------------------//
+
+//  Copyright Beman Dawes 2006, 2007
+//  Copyright Christoper Kohlhoff 2007
+
+//  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)
+
+//  See library home page at http://www.boost.org/libs/system
+
+#ifndef BOOST_ERROR_CODE_HPP
+#define BOOST_ERROR_CODE_HPP
+
+#include <boost/system/config.hpp>
+#include <boost/cstdint.hpp>
+#include <boost/assert.hpp>
+#include <boost/operators.hpp>
+#include <boost/noncopyable.hpp>
+#include <boost/utility/enable_if.hpp>
+#include <ostream>
+#include <string>
+#include <stdexcept>
+#include <functional>
+
+// TODO: undef these macros if not already defined
+#include <boost/cerrno.hpp> 
+
+#if !defined(BOOST_POSIX_API) && !defined(BOOST_WINDOWS_API)
+#  error BOOST_POSIX_API or BOOST_WINDOWS_API must be defined
+#endif
+
+#include <boost/config/abi_prefix.hpp> // must be the last #include
+
+namespace boost
+{
+  namespace system
+  {
+
+    class error_code;
+    class error_condition;
+
+    //  "Concept" helpers  ---------------------------------------------------//
+
+    template< class T >
+    struct is_error_code_enum { static const bool value = false; };
+
+    template< class T >
+    struct is_error_condition_enum { static const bool value = false; };
+
+    //  generic error_conditions  --------------------------------------------//
+
+    namespace errc
+    {
+      enum errc_t
+      {
+        success = 0,
+        address_family_not_supported = EAFNOSUPPORT,
+        address_in_use = EADDRINUSE,
+        address_not_available = EADDRNOTAVAIL,
+        already_connected = EISCONN,
+        argument_list_too_long = E2BIG,
+        argument_out_of_domain = EDOM,
+        bad_address = EFAULT,
+        bad_file_descriptor = EBADF,
+        bad_message = EBADMSG,
+        broken_pipe = EPIPE,
+        connection_aborted = ECONNABORTED,
+        connection_already_in_progress = EALREADY,
+        connection_refused = ECONNREFUSED,
+        connection_reset = ECONNRESET,
+        cross_device_link = EXDEV,
+        destination_address_required = EDESTADDRREQ,
+        device_or_resource_busy = EBUSY,
+        directory_not_empty = ENOTEMPTY,
+        executable_format_error = ENOEXEC,
+        file_exists = EEXIST,
+        file_too_large = EFBIG,
+        filename_too_long = ENAMETOOLONG,
+        function_not_supported = ENOSYS,
+        host_unreachable = EHOSTUNREACH,
+        identifier_removed = EIDRM,
+        illegal_byte_sequence = EILSEQ,
+        inappropriate_io_control_operation = ENOTTY,
+        interrupted = EINTR,
+        invalid_argument = EINVAL,
+        invalid_seek = ESPIPE,
+        io_error = EIO,
+        is_a_directory = EISDIR,
+        message_size = EMSGSIZE,
+        network_down = ENETDOWN,
+        network_reset = ENETRESET,
+        network_unreachable = ENETUNREACH,
+        no_buffer_space = ENOBUFS,
+        no_child_process = ECHILD,
+        no_link = ENOLINK,
+        no_lock_available = ENOLCK,
+        no_message_available = ENODATA,
+        no_message = ENOMSG,
+        no_protocol_option = ENOPROTOOPT,
+        no_space_on_device = ENOSPC,
+        no_stream_resources = ENOSR,
+        no_such_device_or_address = ENXIO,
+        no_such_device = ENODEV,
+        no_such_file_or_directory = ENOENT,
+        no_such_process = ESRCH,
+        not_a_directory = ENOTDIR,
+        not_a_socket = ENOTSOCK,
+        not_a_stream = ENOSTR,
+        not_connected = ENOTCONN,
+        not_enough_memory = ENOMEM,
+        not_supported = ENOTSUP,
+        operation_canceled = ECANCELED,
+        operation_in_progress = EINPROGRESS,
+        operation_not_permitted = EPERM,
+        operation_not_supported = EOPNOTSUPP,
+        operation_would_block = EWOULDBLOCK,
+        owner_dead = EOWNERDEAD,
+        permission_denied = EACCES,
+        protocol_error = EPROTO,
+        protocol_not_supported = EPROTONOSUPPORT,
+        read_only_file_system = EROFS,
+        resource_deadlock_would_occur = EDEADLK,
+        resource_unavailable_try_again = EAGAIN,
+        result_out_of_range = ERANGE,
+        state_not_recoverable = ENOTRECOVERABLE,
+        stream_timeout = ETIME,
+        text_file_busy = ETXTBSY,
+        timed_out = ETIMEDOUT,
+        too_many_files_open_in_system = ENFILE,
+        too_many_files_open = EMFILE,
+        too_many_links = EMLINK,
+        too_many_synbolic_link_levels = ELOOP,
+        value_too_large = EOVERFLOW,
+        wrong_protocol_type = EPROTOTYPE
+      };
+
+    } // namespace errc
+
+# ifndef BOOST_SYSTEM_NO_DEPRECATED
+    namespace posix = errc;
+    namespace posix_error = errc;
+# endif
+
+    template<> struct is_error_condition_enum<errc::errc_t>
+      { static const bool value = true; };
+
+
+    //  ----------------------------------------------------------------------//
+
+    //  Operating system specific interfaces  --------------------------------//
+
+
+    //  The interface is divided into general and system-specific portions to
+    //  meet these requirements:
+    //
+    //  * Code calling an operating system API can create an error_code with
+    //    a single category (system_category), even for POSIX-like operating
+    //    systems that return some POSIX errno values and some native errno
+    //    values. This code should not have to pay the cost of distinguishing
+    //    between categories, since it is not yet known if that is needed.
+    //
+    //  * Users wishing to write system-specific code should be given enums for
+    //    at least the common error cases.
+    //
+    //  * System specific code should fail at compile time if moved to another
+    //    operating system.
+
+    //  The system specific portions of the interface are located in headers
+    //  with names reflecting the operating system. For example,
+    //
+    //       <boost/system/cygwin_error.hpp>
+    //       <boost/system/linux_error.hpp>
+    //       <boost/system/windows_error.hpp>
+    //
+    //  These headers are effectively empty for compiles on operating systems
+    //  where they are not applicable.
+
+    //  ----------------------------------------------------------------------//
+
+    //  class error_category  ------------------------------------------------//
+
+    class error_category : public noncopyable
+    {
+    public:
+      virtual ~error_category(){}
+      virtual inline const char *    name() const;  // see implementation note below
+      virtual inline std::string     message( int ev ) const;   // see implementation note below
+      virtual inline error_condition default_error_condition( int ev ) const;
+      virtual inline bool equivalent( int code, const error_condition & condition ) const;
+      virtual inline bool equivalent( const error_code & code, int condition ) const;
+
+      bool operator==(const error_category & rhs) const { return this == &rhs; }
+      bool operator!=(const error_category & rhs) const { return this != &rhs; }
+      bool operator<( const error_category & rhs ) const
+      {
+        return std::less<const error_category*>()( this, &rhs );
+      }
+    };
+
+    //  predefined error categories  -----------------------------------------//
+
+    BOOST_SYSTEM_DECL const error_category &  get_system_category();
+    BOOST_SYSTEM_DECL const error_category &  get_generic_category();
+
+    static const error_category &  system_category = get_system_category();
+    static const error_category &  generic_category = get_generic_category();
+    
+# ifndef BOOST_SYSTEM_NO_DEPRECATED
+    //  deprecated synonyms
+    inline const error_category &  get_posix_category() { return get_generic_category(); }
+    static const error_category &  posix_category = get_generic_category();
+    static const error_category &  errno_ecat     = get_generic_category();
+    static const error_category &  native_ecat    = get_system_category();
+# endif
+
+    //  class error_condition  -----------------------------------------------//
+
+    //  error_conditions are portable, error_codes are system or library specific
+
+    class error_condition
+    {
+    public:
+
+      // constructors:
+      error_condition() : m_val(0), m_cat(&get_generic_category()) {}
+      error_condition( int val, const error_category & cat ) : m_val(val), m_cat(&cat) {}
+
+      template <class ErrorConditionEnum>
+        error_condition(ErrorConditionEnum e,
+          typename boost::enable_if<is_error_condition_enum<ErrorConditionEnum> >::type* = 0)
+      {
+        *this = make_error_condition(e);
+      }
+
+      // modifiers:
+
+      void assign( int val, const error_category & cat )
+      { 
+        m_val = val;
+        m_cat = &cat;
+      }
+                                             
+      template<typename ErrorConditionEnum>
+        typename boost::enable_if<is_error_condition_enum<ErrorConditionEnum>, error_condition>::type &
+          operator=( ErrorConditionEnum val )
+      { 
+        *this = make_error_condition(val);
+        return *this;
+      }
+
+      void clear()
+      {
+        m_val = 0;
+        m_cat = &get_generic_category();
+      }
+
+      // observers:
+      int                     value() const    { return m_val; }
+      const error_category &  category() const { return *m_cat; }
+      std::string             message() const  { return m_cat->message(value()); }
+
+      typedef void (*unspecified_bool_type)();
+      static void unspecified_bool_true() {}
+
+      operator unspecified_bool_type() const  // true if error
+      { 
+        return m_val == 0 ? 0 : unspecified_bool_true;
+      }
+
+      bool operator!() const  // true if no error
+      {
+        return m_val == 0;
+      }
+
+      // relationals:
+      //  the more symmetrical non-member syntax allows enum
+      //  conversions work for both rhs and lhs.
+      inline friend bool operator==( const error_condition & lhs,
+                                     const error_condition & rhs )
+      {
+        return lhs.m_cat == rhs.m_cat && lhs.m_val == rhs.m_val;
+      }                  
+
+      inline friend bool operator<( const error_condition & lhs,
+                                    const error_condition & rhs )
+        //  the more symmetrical non-member syntax allows enum
+        //  conversions work for both rhs and lhs.
+      {
+        return lhs.m_cat < rhs.m_cat
+          || (lhs.m_cat == rhs.m_cat && lhs.m_val < rhs.m_val);
+      }
+
+    private:
+      int                     m_val;
+      const error_category *  m_cat;
+
+    };
+
+    //  class error_code  ----------------------------------------------------//
+
+    //  We want error_code to be a value type that can be copied without slicing
+    //  and without requiring heap allocation, but we also want it to have
+    //  polymorphic behavior based on the error category. This is achieved by
+    //  abstract base class error_category supplying the polymorphic behavior,
+    //  and error_code containing a pointer to an object of a type derived
+    //  from error_category.
+    class error_code
+    {
+    public:
+
+      // constructors:
+      error_code() : m_val(0), m_cat(&get_system_category()) {}
+      error_code( int val, const error_category & cat ) : m_val(val), m_cat(&cat) {}
+
+      template <class ErrorCodeEnum>
+        error_code(ErrorCodeEnum e,
+          typename boost::enable_if<is_error_code_enum<ErrorCodeEnum> >::type* = 0)
+      {
+        *this = make_error_code(e);
+      }
+
+      // modifiers:
+      void assign( int val, const error_category & cat )
+      { 
+        m_val = val;
+        m_cat = &cat;
+      }
+                                             
+      template<typename ErrorCodeEnum>
+        typename boost::enable_if<is_error_code_enum<ErrorCodeEnum>, error_code>::type &
+          operator=( ErrorCodeEnum val )
+      { 
+        *this = make_error_code(val);
+        return *this;
+      }
+
+      void clear()
+      {
+        m_val = 0;
+        m_cat = &get_system_category();
+      }
+
+      // observers:
+      int                     value() const    { return m_val; }
+      const error_category &  category() const { return *m_cat; }
+      error_condition         default_error_condition() const  { return m_cat->default_error_condition(value()); }
+      std::string             message() const  { return m_cat->message(value()); }
+
+      typedef void (*unspecified_bool_type)();
+      static void unspecified_bool_true() {}
+
+      operator unspecified_bool_type() const  // true if error
+      { 
+        return m_val == 0 ? 0 : unspecified_bool_true;
+      }
+
+      bool operator!() const  // true if no error
+      {
+        return m_val == 0;
+      }
+
+      // relationals:
+      inline friend bool operator==( const error_code & lhs,
+                                     const error_code & rhs )
+        //  the more symmetrical non-member syntax allows enum
+        //  conversions work for both rhs and lhs.
+      {
+        return lhs.m_cat == rhs.m_cat && lhs.m_val == rhs.m_val;
+      }
+
+      inline friend bool operator<( const error_code & lhs,
+                                    const error_code & rhs )
+        //  the more symmetrical non-member syntax allows enum
+        //  conversions work for both rhs and lhs.
+      {
+        return lhs.m_cat < rhs.m_cat
+          || (lhs.m_cat == rhs.m_cat && lhs.m_val < rhs.m_val);
+      }
+                  
+      private:
+      int                     m_val;
+      const error_category *  m_cat;
+
+    };
+
+    //  predefined error_code object used as "throw on error" tag
+    BOOST_SYSTEM_DECL extern error_code throws;
+
+    //  non-member functions  ------------------------------------------------//
+
+    inline bool operator!=( const error_code & lhs,
+                            const error_code & rhs )
+    {
+      return !(lhs == rhs);
+    }
+
+    inline bool operator!=( const error_condition & lhs,
+                            const error_condition & rhs )
+    {
+      return !(lhs == rhs);
+    }
+
+    inline bool operator==( const error_code & code,
+                            const error_condition & condition )
+    {
+      return code.category().equivalent( code.value(), condition )
+        || condition.category().equivalent( code, condition.value() );
+    }
+                
+    inline bool operator!=( const error_code & lhs,
+                            const error_condition & rhs )
+    {
+      return !(lhs == rhs);
+    }
+                
+    inline bool operator==( const error_condition & condition,
+                            const error_code & code )
+    {
+      return condition.category().equivalent( code, condition.value() )
+        || code.category().equivalent( code.value(), condition );
+    }
+                
+    inline bool operator!=( const error_condition & lhs,
+                            const error_code & rhs )
+    {
+      return !(lhs == rhs);
+    }
+                  
+    // TODO: both of these may move elsewhere, but the LWG hasn't spoken yet.
+
+    template <class charT, class traits>
+    inline std::basic_ostream<charT,traits>&
+      operator<< (std::basic_ostream<charT,traits>& os, error_code ec)
+    {
+      os << ec.category().name() << ':' << ec.value();
+      return os;
+    }
+
+    inline std::size_t hash_value( const error_code & ec )
+    {
+      return static_cast<std::size_t>(ec.value())
+        + reinterpret_cast<std::size_t>(&ec.category());
+    }
+
+    //  make_* functions for errc::errc_t  -----------------------------//
+
+    namespace errc
+    {
+      //  explicit conversion:
+      inline error_code make_error_code( errc_t e )
+        { return error_code( e, get_generic_category() ); }
+
+      //  implicit conversion:
+      inline error_condition make_error_condition( errc_t e )
+        { return error_condition( e, get_generic_category() ); }
+    }
+
+    //  error_category default implementation  -------------------------------//
+
+    inline error_condition error_category::default_error_condition( int ev ) const
+    { 
+      return error_condition( ev, *this );
+    }
+
+    inline bool error_category::equivalent( int code,
+      const error_condition & condition ) const
+    {
+      return default_error_condition( code ) == condition;
+    }
+
+    inline bool error_category::equivalent( const error_code & code,
+      int condition ) const
+    {
+      return *this == code.category() && code.value() == condition;
+    }
+
+    //  error_category implementation note: VC++ 8.0 objects to name() and
+    //  message() being pure virtual functions. Thus these implementations.
+    inline const char * error_category::name() const
+    { 
+      return "error: should never be called";
+    }
+
+    inline std::string error_category::message( int ) const
+    { 
+      static std::string s("error: should never be called");
+      return s;
+    }
+
+  } // namespace system
+} // namespace boost
+
+#include <boost/config/abi_suffix.hpp> // pops abi_prefix.hpp pragmas
+
+# ifdef BOOST_ERROR_CODE_HEADER_ONLY
+#   include <boost/../libs/system/src/error_code.cpp>
+# endif
+
+#endif // BOOST_ERROR_CODE_HPP
+
+