I have 3 class for my project (Product,Customer,Manager,) .For Example I used Add Remove Update functions in my project.When I use these functions for all classes ,I have a total of 9(3*3) functions. (I used Add Remove Update Functions).I used these in my own project and I need 20 functions.So I will need 7 functions for each class.(7*3=21 Functions).And I need 12 constraints(Constraints For example:Each product can have only one id and cannot be two products with the same ID) .My Project is Production Management System in C++.It would be great if you add a comment line