c++

11) (10 points) Write a function template for a function named sundiff taking two arguments x and y After the function returns, x should become x-y and y should become x+y. The function does not return any value. Assume that both arguments are of the same type and that the type can only be int, float or double. It should be possible to call the function as follows: int a 7 int b 4 sumdiff (a,b) after which the value of a should be 3 and the value of b should be 11