Re: [Nfsen-discuss] passing named parameters

[Maurizio M. <mau...@da...>]

Kiss Gabor [Bitman] wrote:

>Dear Peter,
>
>I suggest to change the parameter passing of library routines like
>NfSenRRD::SetupRRD.
>
>Now caller have set up several trivial params in fixed order:
> 	NfSenRRD::SetupRRD("$NfConf::PROFILESTATDIR/live", $new_source,
> 		$tstart - 300, 0);
>
>Now I plan to add Holt-Winters forecasting
>
Hi Gabor,
could you recall me how this forecast works, and what are you planning
to use it for?
Thanks,
Maurizio

> into RRDs and probably
>I'd will have other developments. This may make some parameter lists
>long and messy therefore easy to get it wrong.
>
>Hash-line named parameters are more readable:
>
> 	NfSenRRD::SetupRRD(
> 		path	=>	"$NfConf::PROFILESTATDIR/live",
> 		db	=>	$new_source,
> 		start	=>	$tstart - 300,
># No 'force => 0' required because this is the default value
> 		hw	=>	1,	# add Holt-Winters
> 		alpha	=>	0.4,
># Other optional parameters here
> 	);
>
>Then function's head could look like this:
>
>sub SetupRRD {
> 	my %args = @_;
>         my $path  = $args{path};
> 	my $db    = $args{db};
> 	my $start = $args{start};
> 	my $hw    = $args{hw};		# undef (=false) if missing
> 	my $force = $args{force};	# undef (=false) if missing
> 	my $alpha = $args{alpha} || 0.3;
> 	my $beta  = $args{beta}  || 0.002;
> 	my $gamma = $args{gamma} || 0.05;
>
>What is your opinion?
>
>Regards
>
>Gabor
>
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Maurizio Molina
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