templates - C++ get Index value in integer from iterator -

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i trying index value iterator. keep getting error "indirection requires pointer operand ('long' invalid)" idea? need index. on following example, should output 2.

template<typename t> void practice(t begin, t end) {     t = begin;     it++;     it++;     auto index = - begin;     cout << *index; 

cout << index;

no need * dereference.


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