Services & Resources / Wolfram Forums / MathGroup Archive
-----

MathGroup Archive 2007

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Transparently passing on options to other functions

  • To: mathgroup at smc.vnet.net
  • Subject: [mg82314] Re: Transparently passing on options to other functions
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Wed, 17 Oct 2007 04:08:25 -0400 (EDT)
  • References: <ff1ofp$861$1@smc.vnet.net>

Hi,

and the good old method

f[OptionsPattern[{}]] := OptionValue[optf];

Options[g] = {optg -> True};
g[opts : OptionsPattern[]] := (optg /. {opts}) && f[opts]

no warnings and that is the way that options are processed
since version 1.0 ...

I would suggest,to use OptionPattern[] only for complicated
cases like

g[Method->{"HumptyDumpty","Horse"->2,"Wall"->tooHigh},MaxSteps->500]

where you have multiple nested options.

BTW OptionValue[] may be usefull if you have a single option
but normaly one writes

{thisOption1,thisOption2,thisOption3,thisOption4}=
   {Option1,Option2,Option3,Option4} /. {opts} /. Options[ThisFunction];

instead of

{thisOption1,thisOption2,thisOption3,thisOption4}=
   OptionValue /@ {Option1,Option2,Option3,Option4};

Regards
   Jens


Art wrote:
> Let functions f and g be defined as follows:
> 
> f[ OptionsPattern[{}] ] := OptionValue[optf];
> 
> 
> Options[g] = {optg -> True};
> g[opts : OptionsPattern[]] := OptionValue[optg] && f[opts]
> 
> The following gives a warning that optf is not an option value for
> function g.
> 
> g[optg -> False, optf -> False]
> 
> 
> Is there a good way to have OptionValue ignore this fact and not generate
> a warning? What is the proper way to transparently pass through options to
> other functions?
> 
> I would like to not do the following:
> 
> Options[g] = {optg -> True, optf -> Null};
> 
> which eliminates the warning.
> 
> 


  • Prev by Date: Re: Logical evaluation
  • Next by Date: Re: Implicit plotting issues
  • Previous by thread: Re: Transparently passing on options to other functions
  • Next by thread: Releasing several Holds simultaneously