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https://issues.apache.org/jira/browse/ARROW-328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15558615#comment-15558615
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Wes McKinney commented on ARROW-328:
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Here's one reference:
http://stackoverflow.com/questions/10643563/how-to-return-smart-pointers-shared-ptr-by-reference-or-by-value
> [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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