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https://reviews.apache.org/r/41870/
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Review request for mesos, Joris Van Remoortere and Michael Park.


Repository: mesos


Description
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This trivial change adds ref-qualifiers introduced in C++11 to Option::get(). 
This is in sync with what boost/folly `optional` already have.


Diffs
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  3rdparty/libprocess/3rdparty/stout/include/stout/option.hpp 
b58350b312c1969aa86ec679e95af0f97846c141 

Diff: https://reviews.apache.org/r/41870/diff/


Testing
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make check

Verified this enables operations like the following to incur a move instead of 
a copy:

```
Option<T> create();
T t = create().get();
```


Thanks,

Anand Mazumdar

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