[Pdl-porters] Elegant means of dealing with optional PP piddle parameters?

[Diab Jerius]

My PP routine takes a number of piddles, some of which are optional. To
pass the signature check, *something* must be there (a null piddle won't
cut it, unfortunately), but I don't want to wastefully allocate unused
space. Currently the code does the following:

1. populate a bitmapped flag variable in OtherPars (but not(!) called
flags; see https://sourceforge.net/p/pdl/bugs/363/) recording the optional
piddles which are present
2. stuff an existing piddle of the right dimensions into the unused
optional piddle slots (I'm reusing a required piddle for this)

I'm not terribly thrilled with that approach; it seems a bit kludgy.

Any other means of accomplishing the same thing which is a bit more elegant?

Thanks,
Diab

[David Mertens]

Hey Diab,

This sort of approach is precisely what I do in PDL::Drawing::Prima to take
optional threadable arguments. However, you do not need to allocate a
piddle with full dimensions. A one-dimensional piddle of size 1 is
thread-compatible with anything.

David

Post by Diab Jerius
My PP routine takes a number of piddles, some of which are optional. To
pass the signature check, *something* must be there (a null piddle won't
cut it, unfortunately), but I don't want to wastefully allocate unused
1. populate a bitmapped flag variable in OtherPars (but not(!) called
flags; see https://sourceforge.net/p/pdl/bugs/363/) recording the
optional piddles which are present
2. stuff an existing piddle of the right dimensions into the unused
optional piddle slots (I'm reusing a required piddle for this)
I'm not terribly thrilled with that approach; it seems a bit kludgy.
Any other means of accomplishing the same thing which is a bit more elegant?
Thanks,
Diab
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