Re: Preprocessing the arguments of a MACRO function ?

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On 29 August 2011 09:14, David Waroquiers <david.waroquiers@xxxxxxxxx> wrote:
> Hello,
>
> I would like to make a macro MY_ALLOCATE(myarray) where myarray will
> be something like arr(dim1,dim2,...,dimN). The MY_ALLOCATE should be
> replaced by 2 lines :
> 1) allocate(myarray) /* with my array being for example
> arr(dim1,dim2,...,dimN) */
> 2) call to another function like : foo(arr) /* where arr is myarray
> but without the dim1 .... */
>
> Example :
> ndim = 3;
> MY_ALLOCATE(array(ndim,3,12))
> would be changed to :
> allocate(array(ndim,3,12))
> call foo(array)
>
>
> I have tried this :
>
> #define MY_ALLOCATE(myarray(myshape)) allocate(myarray(myshape)) \
>  call foo(myarray)
>
> But it does not work :/
>
> I do not want to have something like MY_ALLOCATE(myarray,myshape), the
> argument list needs to be exactly like in the allocate call.
>
> Any ideas ?
>
> Thanks a lot !
>
> David
>

I feel a little confused with your description you want a macro to be like:

void allocate (yourtype dim1, ...)
{
  va_list args;
  va_start (args, dim1)
...
}
extern void allocate (yourtype, ...);

#define my_macro(...) \
  allocate (__VA_ARGS__)
  do_calls (__VA_ARGS__)

my_macro (myarrary,myshape,....)

This is where i get confused you want your argument to be a call but
then get the identifier of the call? I dont really understand.

I think thats a big enough hint for you to get started though.

--Phil



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