Write a template function that takes as a parameter a vector of objects of some unknown class and two objects obj1 and obj2 of the same class. Modify the input vector to replace every instance of obj 1 in the vector with obj2. If no instances of obj1 are found, add a new element at the end of the vector containing obj2. The function is not a member of any class. (Recall that you can access vectors like arrays, but they have useful methods like size and push_back. Vector declarations look like this: vector varName