The subject of this should read "Null type error when using option outside
of construction" but for whatever reason (maybe pebcak) didn't stick to the
original post.
On Wed, Jan 18, 2012 at 10:28 AM, Geoff Johnson <geoff....@gmail.com> wrote:
> I'm using the following code to read command line arguments for two integer
> values
>
> ------------------
>
> // inside of a class
>
> static int opt_x_part = 0;
> static int opt_y_part = 0;
>
> ...
>
> public static const OptionEntry[] options = {
> { "xpart", 0, 0, OptionArg.INT, ref opt_x_part,
> "Number of partitions in the x direction", null },
> { "ypart", 0, 0, OptionArg.INT, ref opt_y_part,
> "Number of partitions in the y direction", null },
> { null }
> };
>
> ...
>
> public int x_part { get; set; default=0; }
> public int y_part { get; set; default=0; }
> public int n_part { get; set; default=0; }
>
> ...
>
> // in the constructor
>
> if (opt_x_part != 0) {
> x_part = opt_x_part;
> }
> if (opt_y_part != 0) {
> y_part = opt_y_part;
> }
>
> n_part = x_part * y_part;
>
> ------------------
>
> Later on in the code I want to use n_part but whenever I do I get the
> following error during compile:
>
> julia.vala:166.21-166.30: error: Relational operation not supported for
> types `int' and `null'
> for (i = 0; i < n_part; i++) {
>
> I assume that it thinks that there's a chance that n_part could be null
> because of the ref to opt_x_part/opt_y_part made in the options, but I'm a
> little confused as to why they are usable during construction but not
> afterwards. What is the way to deal with options correctly to avoid this
> error?
>
> Thanks,
> Geoff
>
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>
>
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