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think-cell / think-cell-library

think-cell core library
https://www.think-cell.com/en/career/devblog/overview
Boost Software License 1.0
407 stars 52 forks source link

add missing header #14

Closed frederich closed 7 years ago

frederich commented 7 years ago

return_value_or_none type is boost::optional, resolve dependency

Signed-off-by: Jens Frederich jfrederich@gmail.com