Re^3: typeglob: $var = *x ???

But I did $var = *x

So did I. I said \*x also works.

it's not obvious that $val needs dereferencing.

I showed that it doesn't need dereferencing.

$gv = *x; @$gv  =>  @x
[download]

Of course, one needs to use the sigil to access the components of the glob.

$gv = *x;
$gv{ARRAY}    # Obviously wrong.
*$gv{ARRAY}   # Ok
[download]

...and not this:

Do you really want print($count + 2) to use $count as a file handle?

print(STDOUT + 2)   =>  print( { STDOUT } 2 )
[download]

Barewords will be handled as expected, but anything else followed by what could be an infix operator will be treated as an argument to that operator.

print(*STDOUT + 2)  =>  print( { select() } *STDOUT+2 )
print(*$x + 2)      =>  print( { select() } *$x+2 )
print($x + 2)       =>  print( { select() } $x+2 )
[download]

Comment on Re^3: typeglob: $var = *x ??? Select or Download Code

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Re^4: typeglob: $var = *x ??? by 7stud (Deacon) on Jun 16, 2011 at 08:23 UTC
I showed that it doesn't need dereferencing. `$gv = *x; @$gv => @x` [download] perlreftut says that the syntax @$gv is a shortcut for @{$gv}, and that looks like the very definition of dereferencing to me (see perlreftut, Use Rule 1). As far as I can tell, the only time you don't have to dereference the variable is when you use it as a filehandle--in that case it appears that perl uses the context to determine that it should extract the filehandle part of the typeglob.	[reply] [d/l]
Re^5: typeglob: $var = *x ??? by ikegami (Patriarch) on Jun 16, 2011 at 15:30 UTC
that looks like the very definition of dereferencing to me I thought you meant `$gv` vs `$gv` it's not obvious that $val needs dereferencing.* Completely false. "@foo" returns the list of elements in the array. "$foo" does not. According to you, (A) and (B) and (C) should be the same? `A: @m = $x; B: @m = @$x; C: @m = $$x;` [download] The only thing that may not be obvious is that globs can be "dereferenced" instead of having to do `$gv{ARRAY}`. As far as I can tell, the only time you don't have to dereference the variable is when you use it as a filehandle* Both the "`@`" and "`print`" operators accept a scalar containing a glob. The first peeks into the ARRAY slot. The latter peeks into the IO slot. Both "dereference" the glob.	[reply] [d/l] [select]