Frederic L 7a5eda5914 global: Use std::optional instead of boost::optional (#1578)
* get rid of boost::optional

* Remove optional references

* Use std::reference_wrapper for optional references

* Fix clang format

* Fix clang format part 2

* Adressed feedback

* Fix clang format and MacOS build
2018-10-30 00:03:25 -04:00
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