Why is it not possible to overload insertion operators in c++ for a dynamic array?

I'm new to C++. Just out of curiosity, I'm trying to see what happens when I try to overload the insertion ">>" operator for a class of dynamic array. I think what I'm trying to do is impossible. But could anyone explain what this error means? (error below the code)

#include<iostream>  using namespace std;    template<class Type>  class Array{      private:      int length;      Type* ptrarr;        public:          int size() const;          Type* get_array() const;          friend istream& operator >> (istream& s, Array<Type>& arr);    };    template<class Type>  int Array<Type>::size() const{      return length;  }    template<class Type>  Type* Array<Type>::get_array() const{      return ptrarr;  }    template<class Type>  istream& operator >> (istream& s, Array<Type>& arr){      cout << "Enter length of array"; cin >> arr.length;      arr.ptrarr = new Type[arr.length];      for(int i = 0; i < arr.length; i++){          cout << "Array[" << i << "] = ";          cin >> *(arr.ptrarr + i);      }      return s;  }      int main(){      Array<int> intarray;      cin >> intarray;      int* ptr = intarray.get_array();      for(int i =0; i < intarray.size(); i++)          cout << *(ptr+i);      return 0;  }    

I get the error

in function `main':  dyn_array.cpp:(.text+0x1e): undefined reference to `operator>>(std::istream&, Array<int>&)'  clang: error: linker command failed with exit code 1 (use -v to see invocation)  

https://stackoverflow.com/questions/66978577/why-is-it-not-possible-to-overload-insertion-operators-in-c-for-a-dynamic-arra April 07, 2021 at 09:54AM