[Swift-user] empty array in Swift

[Ketan Maheshwari]

Thanks Mike. This worked.


On Mon, Feb 3, 2014 at 12:22 PM, Wilde, Michael J. <wilde at mcs.anl.gov>wrote:

>  The following following should declare an array with no elements:
>
>    string args[];
>
>     - Mike
> --
> Michael Wilde
> Mathematics and Computer Science          Computation Institute
> Argonne National Laboratory                    The University of Chicago
>
>     ------------------------------
> *From:* swift-user-bounces at ci.uchicago.edu [
> swift-user-bounces at ci.uchicago.edu] on behalf of Ketan Maheshwari [
> ketan at mcs.anl.gov]
> *Sent:* Monday, February 03, 2014 11:44 AM
> *To:* Swift User
> *Subject:* [Swift-user] empty array in Swift
>
>   Hi,
>
>  I was working on a problem where user can pass a dynamic number of
> arguments to an app, including zero.
>
>  A possible Swift script as follows:
>
>  type file;
>
>  app (file _out, file _err) anapp(file _exec, int _i, string _args[]){
>     sh @_exec _i _args stdout=@_out stderr=@_err;
> }
> string args[]=["any", "num", "args"]; # generated via a wrapper script
>
>  file exec<"./echo.sh">;
> foreach i in [0:9:1]{
>     file out <single_file_mapper; file=@strcat("outloc", "/", i, ".out")>;
>     file err <single_file_mapper; file=@strcat("outloc", "/", i, ".err")>;
>     (out,err) = anapp(exec, i, args);
> }
>
>  However, it seems that I cannot have an array with no elements:
>
>  string args[]=[];
>
>  In this case Swift complains:
> Compile error in assignment at line 8: You cannot assign value of type
> [int] to a variable of type string[int]
>
>  Which works when I say:
>
>  string args[]=[""]
>
>  However, it results in an array with one element.
>
>  So, is there a way in Swift to have an array with zero elements?
>
>  Thanks,
> Ketan
>
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