Re: char ***argc problems.

[Timon Gehr]

On 08/12/2012 11:38 PM, Andrew wrote:

On Sunday, 12 August 2012 at 20:57:34 UTC, Timon Gehr wrote:

On 08/12/2012 10:33 PM, Andrew 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?

-Andrew

Maybe like this?

import std.algorithm, std.array, std.conv;
void main(string[] args){
    auto argarr = args.map!(a=>(a ~ '\0').ptr).array;

    int argc = to!(int)(argarr.length);
    auto argv = argarr.ptr;

    MPI_Init(&argc, &argv);

    args = argv[0..argc].map!(to!string).array;

    // ...
}

I don't know why I didn't think of this:

auto argv = argarr.ptr;

Which fixed it.

Unfortunately, using args.map! doesn't work, because it returns
an immutable, which MPI_Init can't take.

oops.
auto argarr = args.map!(a=>(a.dup ~ '\0').ptr).array;

Thanks for the help

-Andrew