Access Specifiers

Unlike any other class module or system on Roblox, Class++ comes with an Access Specifier system. Like in other OO (Object Oriented) languages such as C++, it provides you a way to modify the access control of a member. There are 4 access specifiers in Class++: Public, Private, Protected, and Friend.
(Protected and Friend are mentioned in later pages.)

Public Access Specifier

Like you have seen in the examples on the previous page, the Public Access Specifier allows anything to access a member. Whether it be from a function inside the class or from the script's main thread, the member is accessible and can be modified.

local class = ClassPP.class

local Car = class "Car" {
    Public = {
        Brand = "Lamborghini",
    }
}

local newCar = Car.new()
newCar.Brand = "Tesla"

In this example, we created a new class with a Public member Brand that has the default value of Lamborghini.
Then we created a new object from this class and modified the Brand member of this object. Now the value is set to Tesla.

Private Access Specifier

Private access specifier allows you to hide a member from anyone outside from that class. No one besides the class members can access this member or modify it.

local class = ClassPP.class

local Car = class "Car" {
    Public = {
        Brand = "Lamborghini",
    },
    Private = {
        License_Plate = "XXXX"
    }
}

local newCar = Car.new()
newCar.License_Plate = "YYYY" -- This will error!

In this example, we updated the previous class with a private member named License_Plate, this member is private and can only be accessed by the class members, so trying to access or modify it outside of the class will cause an error.

Warning

A member (property/attribute) can be declared only once. This means a member can only be defined under one access specifier. Attempting to declare a member in multiple access specifiers will cause an error.