Submisison Checklist

• Run tests: ./runCmdStanTests.py src/test
• Declare copyright holder and open-source license: see below

Summary:

Closes #1170.

Code is not necessarily the nicest. I used an out parameter so I could use the normal overload mechanism to keep the class generic

Intended Effect:

Remove deprecation warnings.

How to Verify:

Side Effects:

Documentation:

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• Code: BSD 3-clause (https://opensource.org/licenses/BSD-3-Clause)
• Documentation: CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)