Re: [git/perl] unusual syntax?

From: David Christensen <david@endpoint.com>
Date: Aug 4, 2008, 15:01 UTC
Message-ID: <77D646CF-448B-434A-B969-653931B4A756@endpoint.com>
In-Reply-To: <be6fef0d0808032149p651309a8o773dca5f16923ee1@mail.gmail.com>

Show 13 quoted lines

> sub _close_hash_and_insert_object {
> 	my ($self) = @_;
>
> 	return unless defined($self->{hash_object_pid});
>
> 	my @vars = map { 'hash_object_' . $_ } qw(pid in out ctx);
>
> 	command_close_bidi_pipe($self->{@vars});
> 	delete $self->{@vars};
> }
> $self->{@vars} evaluates to undef. i can't find any mention of using
> arrays to dereference objects in the manual and elsewhere; is this a
> mistake?

This is a hash slice notation, returning an array of hash values matching the corresponding keys. 5.10 removed some syntax warts in the case of hash slices; this is more portably expressed as @{$self} {@vars}; this should work in 5.10 and earlier versions, and so is the preferred syntax.

Regards,

David -- David Christensen End Point Corporation david@endpoint.com