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/home/pprz/paparazzi/sw/ext/opencv_bebop/opencv/modules/core/include/opencv2/core/persistence.hpp:727:17: note: candidate: void std::cv::read(const std::cv::FileNode&, int&, const int&)
CV_EXPORTS void read(const FileNode& node, std::string& value, const std::string& default_value);
^~~~
In file included from /usr/include/c++/7/functional:58:0,
from /home/pprz/paparazzi/sw/ext/opencv_bebop/opencv/modules/core/include/opencv2/core/utility.hpp:60,
from /home/pprz/paparazzi/sw/ext/opencv_bebop/opencv/modules/core/src/precomp.hpp:49,
from /home/pprz/paparazzi/sw/ext/opencv_bebop/opencv/modules/core/src/mean.cpp:6:
/usr/include/c++/7/bits/std_function.h: In instantiation of ‘_Res std::std::function<_Res(_ArgTypes ...)>::operator()(_ArgTypes ...) const [with _Res = void; _ArgTypes = {const std::cv::Range&}]’:
/home/pprz/paparazzi/sw/ext/opencv_bebop/opencv/modules/core/include/opencv2/core/utility.hpp:587:24: required from here
/usr/include/c++/7/bits/std_function.h:706:71: error: return-statement with a value, in function returning 'void' [-fpermissive]
return _M_invoker(_M_functor, std::forward<_ArgTypes>(__args)...);
^
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