Re: using lexically scoped variable as a filehandle

That's perfectly fine, as long as you don't use write, which requires filehandles (and formats) to be global, i.e they must be in the symbol table.

--shmem

_($_=" "x(1<<5)."?\n".q·/)Oo.  G°\        /
                              /\_¯/(q    /
----------------------------  \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}

Comment on Re: using lexically scoped variable as a filehandle

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Re^2: using lexically scoped variable as a filehandle by varian (Chaplain) on Feb 21, 2007 at 14:22 UTC
Thanks all for the reassuring responses although I'm intrigued by the limitations on using non-global handles with the write function. Since this type of code will go into a modperl environment (so the 'program' will never really terminate) it is important to be 100% sure the system will indeed close a file and free the associated resources.	[reply]
Re^3: using lexically scoped variable as a filehandle by shmem (Chancellor) on Feb 21, 2007 at 14:38 UTC
Put simple, write operates on both a filehandle and a format, their association is established via the symbol table, namely `FH{IO} FH{FORMAT}` [download] for a filehandle FH. It is possible to emulate write without a typeglob, using formline and the accumulator. See perlform and e.g. Re: How do I print formatted text to a scalar instead of a filehandle?. --shmem _($_=" "x(1<<5)."?\n".q·/)Oo. G°\ / /\_¯/(q / ---------------------------- \__(m.====·.(_("always off the crowd"))."· ");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}	[reply] [d/l]
Re^2: using lexically scoped variable as a filehandle by chromatic (Archbishop) on Feb 21, 2007 at 19:03 UTC
They do have to be in the symbol table, but they don't have to be globals. I won't say more, however, because it's probably better to encourage novices to use something like Perl6::Form instead.	[reply]