From: David Christensen <david@endpoint.com>
Date: Mon, 04 Aug 2008 15:01:44 GMT
Subject: Re: [git/perl] unusual syntax?
Message-ID: <77D646CF-448B-434A-B969-653931B4A756@endpoint.com>
In-Reply-To: <be6fef0d0808032149p651309a8o773dca5f16923ee1@mail.gmail.com>

> 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