Template non-member function friend

Im getting an error saying

a4.cpp:47: warning: friend declaration `Vector<T> operator+(const Vector<T>&, const Vector<T>&)' declares a non-template function
a4.cpp:47: warning: (if this is not what you intended, make sure the function template has already been declared and add <> after the function name here) -Wno-non-template-friend disables this warning

when trying to add this non member function as a friend

friend Vector<T> operator+( const Vector<T> &vec1, const Vector<T> &vec2);

could anyone please help?
a declaration of a template begins with the word template . You can either put the whole function body in (making a separate nontemplate friend for each T) or forward declare a template and friend its full specializations.

why is your operator+ a friend anyway? implement operator+= and then just return vec1+=vec2; from your nonmember nonfriend operator+
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