Hey Malcolm,<br><br>If you're can have your contents in a file, you could get away with what you want by using mmap:<br><br> $ dd if=/dev/urandom count=1000000 of=/tmp/randfile<br>
<br>-- 8< --<br><br>#!/usr/bin/perl<br><br>use strict;<br>use warnings;<br><br>use IO::String;<br>use File::Map qw{<br> map_file<br> unmap<br>};<br><br>print_size();<br><br>map_file my $v, "/tmp/randfile";<br>
print_size();<br><br>my $string = IO::String->new( $v );<br>print_size();<br><br>$string->getline();<br>print_size();<br><br>$string->close();<br>unmap( $v );<br>print_size();<br><br>sub print_size {<br> open my $statm, '< /proc/self/statm'<br>
or die $!;<br><br> my ( $size ) = split /\s/, <$statm>;<br> $size *= 4096;<br><br> print "size: $size\n";<br>}<br><br>-- >8 --<br><br>Output on a 512Mb file is:<br><br> size: 21381120<br>
size: 533381120<br> size: 533381120<br> size: 533381120<br> size: 21381120<br><br>If you can't put the contents in a file, you might still be able to get away with using mmap but you'll have to play with Sys::Mmap (don't give new() the OPTIONALFILENAME param).<br>
<br>Alfie<br><br><div class="gmail_quote">On Sat, Sep 11, 2010 at 8:03 AM, Malcolm Herbert <span dir="ltr"><<a href="mailto:melbourne-pm@mjch.net">melbourne-pm@mjch.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Sent again from the correct address ...<br>
<br>
On Sat, 11 Sep 2010 07:23 +1000, "Malcolm Herbert" <<a href="mailto:mjch@mjch.net">mjch@mjch.net</a>><br>
wrote:<br>
> I want to be able to use an IO::String file handle interface in order to<br>
> interact with one particular class, however I don't want all the data I<br>
> shove into the string to remain hanging around but be able to be retired<br>
> without closing and re-opening the handle - is there a way to do this?<br>
><br>
> I have tried to resize the underlying tied variable with substr and<br>
> remove the aging data that way however this seems to remove the<br>
> association with the original tied variable ... plus leads to problems if<br>
> the class I'm using keeps internal state about the handle ...<br>
><br>
> Regards,<br>
> Malcolm<br>
<font color="#888888"><br>
--<br>
Malcolm Herbert This brain intentionally<br>
<a href="mailto:mjch@mjch.net">mjch@mjch.net</a> left blank<br>
<br>
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