In file included from main.cpp:2:0:
SmartPointer.hpp: In member function 'smart_pointer::SmartPointer<T, Allocator>& smart_pointer::SmartPointer<T, Allocator>::operator=(smart_pointer::SmartPointer<T, Allocator>::value_type*)':
SmartPointer.hpp:70:27: error: 'x' was not declared in this scope
             core->point = x;
                           ^