[Oorexx-rfes] [ oorexx-Feature Requests-1727936 ] Array's "first"-method: add multidimensionality support

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Feature Requests item #1727936, was opened at 2007-05-29 17:47
Message generated for change (Comment added) made by bigrixx
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Category: Classes
Group: Next Release
Status: Pending
Resolution: Fixed
Priority: 5
Private: No
Submitted By: Rony G. Flatscher (orexx)
>Assigned to: David Ashley (wdashley)
Summary: Array's "first"-method: add multidimensionality support

Initial Comment:
Now that the array class supports a single-dimension object as an index for multidimensional arrays, the method "first" should support that feature as well.

An implementation to support this feature may look like (tested):

---------------- cut here ---------------
::method first       -- single & multidimensional first
  d=self~dimension         -- get number of dimensions

  if d=0 then return .nil  -- no dimension yet (result of ".array~new")
  if d=1 then return 1     -- return integer

  a=.array~new             -- create & return array object
  do d                     -- set all indexes to "1"
     a~append(1)
  end
  return a
---------------- cut here ---------------


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>Comment By: Rick McGuire (bigrixx)
Date: 2007-06-20 09:42

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Remove the restriction about FIRST only working on single-dimension
arrays. 

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Comment By: Rick McGuire (bigrixx)
Date: 2007-05-29 18:35

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Committed revision 411.

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Comment By: Rony G. Flatscher (orexx)
Date: 2007-05-29 18:08

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Oh, I see! 
(But then that's true for all the other three as well. They either return
the index of the first/last or next/previous item, not the
first/last/next/previous index, if that has no entry.)

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Comment By: Rick McGuire (bigrixx)
Date: 2007-05-29 18:01

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This is not equivalent to the existing first method for arrays.  The first
method returns the index of the first real item within the array, not the
index of the first addressable slot.  For example, 

x = .array~new
x[3] = 5
say x~first   -- displays "3", not "1"

the last method has a similar problem.  In order to implement this, you'd
need to define what the iteration order for a multi-dimensional array. 
Fortunately, there is a precedent with the "makearray" function.  This
function will be easier to implement in the  base C++ code than in Rexx
code as all of the pieces already exist to implement this. 



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