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Inconsistency in creating/opening/closing/destroying connections (PR#787)

2 messages · Jens Oehlschlägel, Brian Ripley

Original
Jens Oehlschlägel
# 
I expected close() to be the opposite of open(), but
Error in open.connection(con, "w") : invalid connection
Error in summary.connection(x) : invalid connection
help to showConnections obviously also was assuming that there may EXIST something like a CLOSED connection, as it says 
all logical: if true all connections, including CLOSED ONES and the standard ones are displayed. If false only open user-created connections are included. 

So this is at least a documentation bug, but what about having something like

CreateConnection
  OpenConnection
  CloseConnection
DestroyConnection

Is there any reason to have (as currently) OpenConnection seperated from CreateConnection but CloseConnection and DestroyConnection combined?

Regards


Jens Oehlschlägel


--please do not edit the information below--

Version:
 platform = i386-pc-mingw32
 arch = x86
 os = Win32
 system = x86, Win32
 status = 
 major = 1
 minor = 2.0
 year = 2000
 month = 12
 day = 15
 language = R

Windows NT 4.0 (build 1381) Service Pack 6

Search Path:
 .GlobalEnv, package:ctest, Autoloads, package:base

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Brian Ripley
#
On Wed, 20 Dec 2000 joehl@web.de wrote:

            

      
      
      
    

        
Why?  It is not documented to be so, as far as I know.

            

      
      
      
    

        
Can you please elucidate here?  I don't think any documentation says
open is the opposite of close. I think you are just assuming things that
are not said.  Note:  ?close says

     `close' closes and destroys a connection.

not just closes it, so there can be closed and not destroyed connections.

            

      
      
      
    

        
Yes.  These are S4-type connections, and that is what S4 does.