[] indexing of Array type.

[Quentin Spencer]

I'm writing a function in C that I would like to make available to an 
other program without requiring the octave headers, so I'm writing an 
octave wrapper around it. I'd like to be able to create an octave array 
of the size I want, and then pass a pointer to the data within the array 
to the external function so that the external function does not require 
octave headers. I have been able to do something like this:

RowVector x(SIZE);
const double* y=x.data();
external_func(y);

However, this gives read-only access to the data (it won't compile 
unless y is declared as a const double*). Suppose I want to create an 
external_func(const double* y, double* z) that takes y as input, and 
puts values in z. The only way I've successfully done this so far is by 
creating the array and then copying the results into an octave Array 
type in the wrapper function, which seems like unnecessary overhead. Is 
there any way I can just access the pointer directly  using the data 
member function without making the declaration a const?

-Quentin



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