Re: char ***argc problems.

[Simen Kjaeraas]

On Sun, 12 Aug 2012 22:30:57 +0200, Andrew <andrew.sp...@gmail.com> wrote:

I'm attempting to create a wrapper for MPI, however, MPI_Init
wants to read the arguments for main():

MPI_Init(int *argv, char ***argc);

How do I get this last level of pointer reference?

So far, I have:

void main (string[] args)
{
      auto argarr = new char*[args.length];
      foreach(i, a; args)
          argarr[i] = (a.dup ~ '\0').ptr;

      int argc = to!(int)(argarr.length);
      MPI_Init(&argc, argarr.ptr);
}

Any ideas?

    // Array of pointers to command line parameters.
    char*[] argv = args.map!((a)=>(a.dup~'\0').ptr).array;
    // Address of first element of that array.
    char** argvp = &argv[0];
    // And finally, address of the pointer to that first element.
    char*** argvpp = &argvp;

Now, the interesting part is reconstructing the string[] from
the potentially modified argvpp...

--
Simen