[task #15109] Size of dataset as an Arithmetic operator

[Mohammad Akhlaghi]

Follow-up Comment #14, task #15109 (project gnuastro):

I recommend reading through the data.h documentation
<http://www.gnu.org/software/gnuastro/manual/html_node/Library-data-container.html>,
with its subsections. All Gnuastro programs use this structure for
reading/writing datasets of any type and size, with some basic metadata.

The `gal_data_alloc' function does the allocation of the necessary space in
memory (for the given type and number of elements it has). You just have to
write into it. 

A simple/readable way to read/write to the datasets' arrays is similar to what
we discussed before about the `arg' dataset: once you know the dataset's size,
you define a pointer of that type, then set the pointer to point to the
dataset's allocated space for data. For example, if you want it to be `size_t'
(the type for "size"-related things that can never be negative), you can do
this:


size_t *out_arr;
out_arr=out->array;
out_arr[0]=in->dsize[arg_val-1];


But please read the data.h documentation first to avoid future confusions ;-).

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