In file included from /in/driver/main.cpp:8:0:
/in/kdtree.hpp: In instantiation of 'KDTree<std::tuple<_Elements ...>, ValueType>& KDTree<std::tuple<_Elements ...>, ValueType>::operator=(const KDTree<std::tuple<_Elements ...>, ValueType>&) [with ValueType = std::__cxx11::basic_string<char>; KeyTypes = {int, int, int}]':
/in/driver/main.cpp:146:23:   required from here
/in/kdtree.hpp:463:22: error: 'copyFrom' was not declared in this scope
         root=copyFrom(that.root,nullptr);
              ~~~~~~~~^~~~~~~~~~~~~~~~~~~
/in/kdtree.hpp:463:22: note: suggested alternative: 'copy'
         root=copyFrom(that.root,nullptr);
              ~~~~~~~~^~~~~~~~~~~~~~~~~~~
              copy