Replace boost::optional with std::optional #6611
Merged
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Issue
This PR target at (partially) resolving #6551.
That is exchanging boost::optional for std::optional from C++17.
As mentioned elsewhere (#6429 (comment))
boost::spirit::qi does not work with std::optional, however boost::spirit::x3 does.
This PR does NOT refactor these parts of the codebase. To my knowledge there are three parsers written with ::qi (and ::phoenix) and at least the time validator and CSV parser I was abled to at least work on. (not included in this PR)
However the core API of /server alses uses ::qi and changing this would be a more peculiar if not a bad decision (for now).
Note because of failing CI this is #6593 reopened.
Tasklist