sgilmore10 opened a new pull request, #35479:
URL: https://github.com/apache/arrow/pull/35479
### Rationale for this change
This pull request is a followup to #34563. To facilitate the implementation
of future array types, we would like to first create a C++ template class for
numeric arrays. We also want to start adding basic tests for the array
functionality in the MATLAB interface.
### What changes are included in this PR?
1. Added a C++ template Class called `NumericArray` templated on `CType`.
2. Re-implemented the `Float64Array` C++ proxy class in terms of the new
template class, i.e. `NumericArray<double>`.
3. Added a method called `double()` on the MATLAB Float64Array class to
convert the arrow.[Type]Array to a MATLAB `double` array.
4. Added basic tests for round-tripping float64 arrays.
5. Created a base C++ proxy `Array` class that all proxy array classes will
inherit from.
6. Renamed `Print()` to `ToString()` and made it return a string instead of
printing to the screen.
### Are these changes tested?
Yes, we added automated test cases to the test class `tFloat64Array.m`. In
addition, we manually qualified these changes on macOS.
### Are there any user-facing changes?
Yes, the `Print()` method is no longer public and there is now a method
called `double()` on `arrow.array.Float64Array`.
Included below is a simple example of using the `double()` method:
```matlab
>> arrowArray = arrow.array.Float64Array([1, 2, 3])
arrowArray =
[
1,
2,
3
]
>> matlabArray = double(arrowArray)
matlabArray =
1
2
3
>> class(arrowArray)
ans =
'arrow.array.Float64Array'
>> class(matlabArray)
ans =
'double'
```
### Future Directions
We will add support for
1. The rest of the numeric types.
2. Continue building out the methods (e.g. `length()`)
3. `null` values (validity bitmap).
4. Converting non-ascii characters from `UTF-8` to `UTF-16`.
5. Error handling.
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