Functional Programming main

[PracticalPotato]

So, I've been working on cleaning up the main, and I've gotten to a point where I used functional programming, which bypasses the need to overload a function a billion times. The function replaces the loops that get and check input from cin.

Here's an example of a call to the function:
//check input username against data

getCheckedInput("Please enter your username.\n",
                user,
                INCLUDE, bind(&HashTable<User*>::inSet, Data, placeholders::_1), // Is user in the HashTable?
                "I'm sorry, that username is not found in our data banks. Please try again...\n\n");

As you can see, it's pretty readable except for the line I put a comment on (which will be different most of the time), but you wouldn't be able to write it unless you learn some programming or called me over to do it. Should I continue or go back to function overloading?

[WangWillis]

show us how to do it on thursday
and dont you still need to write the functions out for it though
but we'll see on thursday