operations.hpp

support vector clustering for vc++

          && boost::filesystem::is_directory( ph ) )
        {
          for ( boost::filesystem::basic_directory_iterator<Path> itr( ph );
                itr != end_itr; ++itr )
          {
            count += remove_all_aux( itr->path() );
          }
        }
        boost::filesystem::remove( ph );
        return count;
      }

//  test helper  -------------------------------------------------------------//

    // not part of the documented interface because false positives are possible;
    // there is no law that says that an OS that has large stat.st_size
    // actually supports large file sizes.
      BOOST_FILESYSTEM_DECL bool possible_large_file_size_support();

//  directory_iterator helpers  ----------------------------------------------//

//    forwarding functions avoid need for BOOST_FILESYSTEM_DECL for class
//    basic_directory_iterator, and so avoid iterator_facade DLL template
//    problems. They also overload to the proper external path character type.

      BOOST_FILESYSTEM_DECL boost::filesystem::system_error_type
        dir_itr_first( void *& handle,
#if       defined(BOOST_POSIX_API)
            void *& buffer,
#endif
          const std::string & dir_path,
          std::string & target, file_status & fs, file_status & symlink_fs );
      // eof: return==0 && handle==0

      BOOST_FILESYSTEM_DECL boost::filesystem::system_error_type
        dir_itr_increment( void *& handle,
#if       defined(BOOST_POSIX_API)
            void *& buffer,
#endif
          std::string & target, file_status & fs, file_status & symlink_fs );
      // eof: return==0 && handle==0

      BOOST_FILESYSTEM_DECL boost::filesystem::system_error_type
        dir_itr_close( void *& handle
#if       defined(BOOST_POSIX_API)
            , void *& buffer
#endif
          );
      // Effects: none if handle==0, otherwise close handle, set handle=0

#     if defined(BOOST_WINDOWS_API) && !defined(BOOST_FILESYSTEM_NARROW_ONLY)
      BOOST_FILESYSTEM_DECL boost::filesystem::system_error_type
        dir_itr_first( void *& handle, const std::wstring & ph,
          std::wstring & target, file_status & fs, file_status & symlink_fs );
      BOOST_FILESYSTEM_DECL boost::filesystem::system_error_type
        dir_itr_increment( void *& handle, std::wstring & target,
          file_status & fs, file_status & symlink_fs );
#     endif

      template< class Path >
      class dir_itr_imp
      {
      public:  
        basic_directory_entry<Path> m_directory_entry;
        void *        m_handle;
#       ifdef BOOST_POSIX_API
          void *      m_buffer;  // see dir_itr_increment implementation
#       endif
        dir_itr_imp() : m_handle(0)
#       ifdef BOOST_POSIX_API
          , m_buffer(0)
#       endif
        {}

        ~dir_itr_imp() { dir_itr_close( m_handle
#if       defined(BOOST_POSIX_API)
            , m_buffer
#endif
          ); }
      };

    BOOST_FILESYSTEM_DECL extern system_error_type not_found_error;
    } // namespace detail

//  basic_directory_iterator  ------------------------------------------------//

    template< class Path >
    class basic_directory_iterator
      : public boost::iterator_facade<
          basic_directory_iterator<Path>,
          basic_directory_entry<Path>,
          boost::single_pass_traversal_tag >
    {
    public:
      typedef Path path_type;

      basic_directory_iterator(){}  // creates the "end" iterator

      explicit basic_directory_iterator( const Path & dir_path );
      basic_directory_iterator( const Path & dir_path, system_error_type & ec );

    private:

      // shared_ptr provides shallow-copy semantics required for InputIterators.
      // m_imp.get()==0 indicates the end iterator.
      boost::shared_ptr< detail::dir_itr_imp< Path > >  m_imp;

      friend class boost::iterator_core_access;

      typename boost::iterator_facade<
        basic_directory_iterator<Path>,
        basic_directory_entry<Path>,
        boost::single_pass_traversal_tag >::reference dereference() const 
      {
        BOOST_ASSERT( m_imp.get() && "attempt to dereference end iterator" );
        return m_imp->m_directory_entry;
      }

      void increment();

      bool equal( const basic_directory_iterator & rhs ) const
        { return m_imp == rhs.m_imp; }

      system_error_type m_init( const Path & dir_path );
    };

    typedef basic_directory_iterator< path > directory_iterator;
# ifndef BOOST_FILESYSTEM_NARROW_ONLY
    typedef basic_directory_iterator< wpath > wdirectory_iterator;
# endif

    //  basic_directory_iterator implementation  ---------------------------//

    template<class Path>
    system_error_type basic_directory_iterator<Path>::m_init(
      const Path & dir_path )
    {
      if ( dir_path.empty() )
      {
        m_imp.reset();
        return detail::not_found_error;
      }
      system_error_type sys_err;
      typename Path::external_string_type name;
      file_status fs, symlink_fs;

      if ( (sys_err = detail::dir_itr_first( m_imp->m_handle,
#if   defined(BOOST_POSIX_API)
        m_imp->m_buffer,
#endif
        dir_path.external_directory_string(),
        name, fs, symlink_fs )) != 0 )
      {
        m_imp.reset();
        return sys_err;
      }
      
      if ( m_imp->m_handle == 0 ) m_imp.reset(); // eof, so make end iterator
      else // not eof
      {
        m_imp->m_directory_entry.assign( dir_path
          / Path::traits_type::to_internal( name ), fs, symlink_fs );
        if ( name[0] == dot<Path>::value // dot or dot-dot
          && (name.size() == 1
            || (name[1] == dot<Path>::value
              && name.size() == 2)) )
          {  increment(); }
      }
      return 0;
    }

    template<class Path>
    basic_directory_iterator<Path>::basic_directory_iterator(
      const Path & dir_path )
      : m_imp( new detail::dir_itr_imp<Path> )
    {
      system_error_type ec( m_init(dir_path) );
      if ( ec != 0 )
      {
        boost::throw_exception( basic_filesystem_error<Path>(  
          "boost::filesystem::basic_directory_iterator constructor",
          dir_path, ec ) );
      }
    }

    template<class Path>
    basic_directory_iterator<Path>::basic_directory_iterator(
      const Path & dir_path, system_error_type & ec )
      : m_imp( new detail::dir_itr_imp<Path> )
    {
      ec = m_init(dir_path);
    }

    template<class Path>
    void basic_directory_iterator<Path>::increment()
    {
      BOOST_ASSERT( m_imp.get() && "attempt to increment end iterator" );
      BOOST_ASSERT( m_imp->m_handle != 0 && "internal program error" );
      
      system_error_type sys_err(0);
      typename Path::external_string_type name;
      file_status fs, symlink_fs;

      for (;;)
      {
        if ( (sys_err = detail::dir_itr_increment( m_imp->m_handle,
#if     defined(BOOST_POSIX_API)
          m_imp->m_buffer,
#endif
          name, fs, symlink_fs )) != 0 )
        {
          boost::throw_exception( basic_filesystem_error<Path>(  
            "boost::filesystem::basic_directory_iterator increment",
            m_imp->m_directory_entry.path().branch_path(), sys_err ) );
        }
        if ( m_imp->m_handle == 0 ) { m_imp.reset(); return; } // eof, make end
        if ( !(name[0] == dot<Path>::value // !(dot or dot-dot)
          && (name.size() == 1
            || (name[1] == dot<Path>::value
              && name.size() == 2))) )
        {
          m_imp->m_directory_entry.replace_leaf(
            Path::traits_type::to_internal( name ), fs, symlink_fs );
          return;
        }
      }
    }

    //  basic_directory_entry  -----------------------------------------------//
    
    template<class Path>
    class basic_directory_entry
    {
    public:
      typedef Path path_type;
      typedef typename Path::string_type string_type;

      // compiler generated copy-ctor, copy assignment, and destructor apply

      basic_directory_entry() {}
      explicit basic_directory_entry( const path_type & p,
        file_status st = file_status(), file_status symlink_st=file_status() )
        : m_path(p), m_status(st), m_symlink_status(symlink_st)
        {}

      void assign( const path_type & p,
        file_status st, file_status symlink_st )
        { m_path = p; m_status = st; m_symlink_status = symlink_st; }

      void replace_leaf( const string_type & s,
        file_status st, file_status symlink_st )
     {
       m_path.remove_leaf();
       m_path /= s;
       m_status = st;
       m_symlink_status = symlink_st;
     }

      const Path &   path() const { return m_path; }
      file_status   status() const;
      file_status   status( system_error_type & ec ) const;
      file_status   symlink_status() const;
      file_status   symlink_status( system_error_type & ec ) const;

      // conversion simplifies the most common use of basic_directory_entry
      operator const path_type &() const { return m_path; }

#   ifndef BOOST_FILESYSTEM_NO_DEPRECATED
      // deprecated functions preserve common use cases in legacy code
      typename Path::string_type leaf() const
      {
        return path().leaf();
      }
      typename Path::string_type string() const
      {
        return path().string();
      }
#   endif

    private:
      path_type             m_path;
      mutable file_status  m_status;           // stat()-like
      mutable file_status  m_symlink_status;   // lstat()-like
        // note: m_symlink_status is not used by Windows implementation

    }; // basic_directory_status

    typedef basic_directory_entry<path> directory_entry;
# ifndef BOOST_FILESYSTEM_NARROW_ONLY
    typedef basic_directory_entry<wpath> wdirectory_entry;
# endif

    //  basic_directory_entry implementation  --------------------------------//

    template<class Path>
    file_status
    basic_directory_entry<Path>::status() const
    {
      if ( !status_known( m_status ) )
      {
#     ifndef BOOST_WINDOWS_API
        if ( status_known( m_symlink_status )
          && !is_symlink( m_symlink_status ) )
          { m_status = m_symlink_status; }
        else { m_status = boost::filesystem::status( m_path ); }
#     else
        m_status = boost::filesystem::status( m_path );
#     endif
      }
      return m_status;
    }

    template<class Path>
    file_status
    basic_directory_entry<Path>::status( system_error_type & ec ) const
    {
      if ( !status_known( m_status ) )
      {
#     ifndef BOOST_WINDOWS_API
        if ( status_known( m_symlink_status )
          && !is_symlink( m_symlink_status ) )
          { ec = 0; m_status = m_symlink_status; }
        else { m_status = boost::filesystem::status( m_path, ec ); }
#     else
        m_status = boost::filesystem::status( m_path, ec );
#     endif
      }
      else ec = 0;
      return m_status;
    }

    template<class Path>
    file_status
    basic_directory_entry<Path>::symlink_status() const
    {
#   ifndef BOOST_WINDOWS_API
      if ( !status_known( m_symlink_status ) )
        { m_symlink_status = boost::filesystem::symlink_status( m_path ); }
      return m_symlink_status;
#   else
      return status();
#   endif
    }

    template<class Path>
    file_status
    basic_directory_entry<Path>::symlink_status( system_error_type & ec ) const
    {
#   ifndef BOOST_WINDOWS_API
      if ( !status_known( m_symlink_status ) )
        { m_symlink_status = boost::filesystem::symlink_status( m_path, ec ); }
      else ec = 0;
      return m_symlink_status;
#   else
      return status( ec );
#   endif
    }
  } // namespace filesystem
} // namespace boost

#undef BOOST_FS_FUNC


#include <boost/config/abi_suffix.hpp> // pops abi_prefix.hpp pragmas
#endif // BOOST_FILESYSTEM_OPERATIONS_HPP