C++ Overloading Operator < with an int parameter (comparing to a type that isn't guaranteed to be an int)

Answer 1

I think you need to read this: http://www.devarticles.com/c/a/Cplusplus/Operator-Overloading-in-C-plus/

http://www.java2s.com/Tutorial/Cpp/0200__Operator-Overloading/Catalog0200__Operator-Overloading.htm

Answer 2

Operator overloading doesn't really make sense here.

The member function

bool BST<DataType>::operator >(const int anotherId)const;

Basically means to compare a whole tree with an int, which is not what I think your goal was. You might want to ensure you have < defined for data type, and then also add to the node class something like

template<typename type>
friend bool operator>(const BST<type>::node&, BST<type>::const node&);

My two cents at least.