Re^2: Storing open filehandles in a hash

Can you shed some light on what the braces around $fhs{$conn} do in this case? It must have something to do with the file handle and print string being space separated, but I've been wondering for a while why we need those if we're using anything more complex than $variable_name but don't otherwise.

Comment on Re^2: Storing open filehandles in a hash

Replies are listed 'Best First'.
Re^3: Storing open filehandles in a hash by ikegami (Patriarch) on Nov 20, 2008 at 22:14 UTC
See the last paragraph of `print`'s documentation. To keep the parser sane, `print` is very limited as to what it can accept for the file handle argument. It accepts a scalar variable (`$fh`) or a bare word (`FH`), and that's probably it unless you wrap the expression in curlies. Inside the curlies can be any Perl expression, including the a hash lookup as desired by the OP. `print { $fh } ...; print $fh ...; # Shorthand print { FH } ...; print FH ...; # Same thing, but also works under strict 'vars'. print { FH } ...; print { $a[$i] } ...; print { $h{$k} } ...; print { $o->get_fh() } ...; print { $e ? STDERR : *STDOUT } ...; etc.` [download]	[reply] [d/l] [select]

Replies are listed 'Best First'.

Re^3: Storing open filehandles in a hash
by ikegami (Patriarch) on Nov 20, 2008 at 22:14 UTC

See the last paragraph of print's documentation.

To keep the parser sane, print is very limited as to what it can accept for the file handle argument. It accepts a scalar variable ($fh) or a bare word (FH), and that's probably it unless you wrap the expression in curlies. Inside the curlies can be any Perl expression, including the a hash lookup as desired by the OP.

print { $fh } ...;
print $fh ...;     # Shorthand

print { FH } ...;
print FH ...;      # Same thing, but also works under strict 'vars'.

print { *FH                    } ...;
print { $a[$i]                 } ...;
print { $h{$k}                 } ...;
print { $o->get_fh()           } ...;
print { $e ? *STDERR : *STDOUT } ...;
etc.
[download]

[reply]
[d/l]
[select]