[jira] [Created] (ARROW-328) [C++] Return shared_ptr by value instead of const-ref?

["Wes McKinney (JIRA)" <ji...@apache.org>]

Wes McKinney created ARROW-328:
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             Summary: [C++] Return shared_ptr by value instead of const-ref?
                 Key: ARROW-328
                 URL: https://issues.apache.org/jira/browse/ARROW-328
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Wes McKinney


This is largely my fault but: many C++ programmers seem to feel that you should always return {{std::shared_ptr}} by value for a couple reasons:

* RVO in many cases prevents a double ref-count manipulation and,
* If you are planning to share ownership with the other class, you will need to copy the shared_ptr anyway

On some contemplation I'm +1 on changing all {{const std::shared_ptr<T>&}} to {{std::shared_ptr<T>}}, but let me know if there are other opinions. 



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