From help-octave-request at bevo dot che dot wisc dot edu Wed Feb  4 11:30:31 2004
Subject: converting to new streampos syntax ?
From: "John W. Eaton" <jwe at bevo dot che dot wisc dot edu>
To: "Pascal A. Dupuis" <Pascal dot Dupuis at esat dot kuleuven dot ac dot be>
Cc: help-octave at bevo dot che dot wisc dot edu
Date: Wed, 4 Feb 2004 11:24:49 -0600

On  4-Feb-2004, Pascal A. Dupuis <Pascal dot Dupuis at esat dot kuleuven dot ac dot be> wrote:

| There was a recent change in the interface of ftell, now returning a streampos
| object. How can I now perform the following operations ?
| 
| 1) tell if a stream is seekable. Old way:
| 	cur_pos = ftell(FID);  cur_pos > -1 || error('Can''t seek');

The only comparison operators that work are == and !=.

| 2) push back one character onto a stream. Old way:
|    	fseek(FID, cur_pos - 1);

This should work with the current CVS sources.

|    according to the C++ standards, streampos is an object dealing with
| characters streams, so going back one character should be valid.

Yes.

As for the new limitation of not being able to treat a file position
as an integer, it seems that this is likely to be a problem.  If you'd
like to discuss what to do about it, please subscribe to the
octave-maintainers mailing list and pick up the discussion there.

Thanks,

jwe



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