On Wed, Jan 30, 2002 at 03:55:32PM +0100, Joerg Ziefle wrote:
>
> Not to forget scalar evaluation within strings:
>
> "${\(<foo>)}"
>
> as in:
>
> perl -e 'print "Current time is: ${\(scalar localtime)}\n"'
>
> (the parens could as well have been omitted)
>
> as opposed to the array evaluation
>
> "@{[<foo>]}"
>
> as in:
>
> perl -e 'print "Current time is: @{[scalar localtime]}\n"'
>
> Note the obvious difference to:
>
> perl -e 'print "Current time is: @{[localtime]}\n"'
Eh, it's the "scalar" that makes the scalar evaluation in those
examples. After all "@{[scalar localtime]}" gives the result
of 'localtime' in scalar context, not list context as you suggest.
And you even need the 'scalar' if you are using ${\(EXPR)}, as
\ doesn't propagate context; it provides list context.
#!/usr/bin/perl
use strict;
use warnings 'all';
sub context {wantarray ? "LIST" : "SCALAR"}
print "${\context}\n";
__END__
LIST
This makes the "${\(EXPR)}" not very useful; one could as well use
"@{[EXPR]}" - which not only saves a keystroke, but is more symmetric.
Abigail
