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

[Mohammad Akhlaghi]

Follow-up Comment #9, task #15109 (project gnuastro):

In the previous post I forgot to mention how you can read the contents of
`arg' after doing basic sanity checks.

Again, you can find the way by inspecting other functions, but generally, this
is what I usually do: 1) define a new `size_t' variable, maybe `arg_val'. 2)
Convert `arg' to the `GAL_TYPE_SIZE_T' TYPE (with the
`gal_data_copy_to_new_type_free' function). Note that freeing should only be
done if the freeing flag is set. 3) Now that you know the type of the
`arg->array' pointer, just read/copy it into the variable with something like
this: `arg_val=(size_t *)(arg->array)'. Ofcourse you can also directly read
`arg->array' as a size_t array, its just more clear for a reader if you use a
clearly-named variable.

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