[IronPython] c# function that passes arguments by reference

Frank Kampas fkampas at msn.com
Fri Aug 25 23:17:14 CEST 2006


Ok, that worked but what I got back is not very useful

>>> lpstat = clr.Reference[int](0)
>>> objval = clr.Reference[float](0)
>>> x = clr.Reference[System.Array[float]](System.Array[float]((0,0,0)))
>>> pi = clr.Reference[System.Array[float]](System.Array[float]((0,0,0)))
>>> sl = clr.Reference[System.Array[float]](System.Array[float]((0,0,0)))
>>> dj = clr.Reference[System.Array[float]](System.Array[float]((0,0,0)))
>>> wr.GetResults(lpstat,objval,x,pi,sl,dj)
True
>>> x
<IronPython.Modules.ClrModule+Reference`1[[System.Double[], mscorlib, Version=2.
0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]] object at 0x0000000000
00002E [Reference(System.Double[])]>
>>> lpstat
<IronPython.Modules.ClrModule+Reference`1[[System.Int32, mscorlib, Version=2.0.0
0, Culture=neutral, PublicKeyToken=b77a5c561934e089]] object at 0x0000000000000
02F [Reference(1)]>
>>>

The approach I found seems to be more useful if it doesn't have some problem that
would show up for bigger arrays.


>>> wr.GetResults(0,0,(0,0,0),(0,0,0),(0,0,0),(0,0,0))
(True, 1, 13.0, System.Double[](5.0, 4.0, 0.0), System.Double[](0.0, 0.0, -3.062
5), System.Double[](0.0, 0.0, 0.0), System.Double[](0.0, 0.0625, 0.375))

  ----- Original Message ----- 
  From: Dino Viehland<mailto:dinov at exchange.microsoft.com> 
  To: Discussion of IronPython<mailto:users at lists.ironpython.com> 
  Sent: Friday, August 25, 2006 5:00 PM
  Subject: Re: [IronPython] c# function that passes arguments by reference


  You can do:

   

  import System

  import clr

  clr.Reference[System.Array[int]]( System.Array[int]( (1,2,3) ) )

   

   

  This breaks down into the array creation:

  System.Array[int]( (1,2,3) )

   

  And then passing that to the new instance of clr.Reference.  

   

  From: users-bounces at lists.ironpython.com<mailto:users-bounces at lists.ironpython.com> [mailto:users-bounces at lists.ironpython.com] On Behalf Of Frank Kampas
  Sent: Friday, August 25, 2006 1:43 PM
  To: Discussion of IronPython
  Subject: Re: [IronPython] c# function that passes arguments by reference

   

  how to I create an array to pass by reference?  I assume that your example is creating an integer with a value of 3 to pass by reference.

    ----- Original Message ----- 

    From: Dino Viehland<mailto:dinov at exchange.microsoft.com> 

    To: Discussion of IronPython<mailto:users at lists.ironpython.com> 

    Sent: Friday, August 25, 2006 4:06 PM

    Subject: Re: [IronPython] c# function that passes arguments by reference

     

    This is the "easy" way to call functions that are passing values by reference.  You should be able to pass non-zero values as well as non-empty arrays.  The only thing that should disallow this is if there were multiple overloads that resulted in an ambiguous method resolution.  

     

    For these cases there is a generic Reference type defined in the CLR module.  You can use this:

     

    import clr

    x = clr.Reference[int](3)

     

    someObj.someFunction(x)

     

    print x.Value

     

    and Value will be updated after the call.

     

    From: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] On Behalf Of Frank Kampas
    Sent: Friday, August 25, 2006 12:58 PM
    To: users at lists.ironpython.com
    Subject: [IronPython] c# function that passes arguments by reference

     

    If I import a c# function that passes its arguments (integers and arrays)

    by reference, the only way I can get it to work is pass zeroes for the integers and

    arrays of zero for the arrays.  The results for the variables passed by reference return with the function

    return.  Is that what is supposed to occur?  

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