Re^7: Passing a file handle to a sub. I still don't get it.

One warning: when you use <> or readline in while, assigned to a simple scalar (or by default to $_), perl automatically puts a defined() around your condition, like:

while ( defined( my $line = readline($fh) ) )
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which keeps the loop from prematurely terminating if the $line read happens to be false. This is not done for you using the OO methods.

Comment on Re^7: Passing a file handle to a sub. I still don't get it. Download Code

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Re^8: Passing a file handle to a sub. I still don't get it. by Anonymous Monk on Jun 10, 2005 at 20:57 UTC
Don't worry about false lines. That is only possible when he mucks with $/ or the input line is broken with ^D which is possibly entered to leave the while.	[reply]
Re^9: Passing a file handle to a sub. I still don't get it. by ysth (Canon) on Jun 12, 2005 at 04:55 UTC
^D should yield an eof, which should result in readline returning undef, not "", so the defined() wouldn't make a difference. A false line happens without mucking with $/ when you have a 0 at the end of a file, not followed by a newline.	[reply]