Variable Scope Question

[onyx cobalt]

I am learning Rust, and created a simple binary search bot for the guessing game the book walks you through. I currently create the number the bot should guess into the function, but technically the bot function shouldn't have access to the secret number variable. I want to initialize it somewhere else, but not have full access to it. In C# I'd normally create my variable at a class level scope. What is the equivalent in Rust? NB: The closest language I've ever used to Rust is Golang for work. I have an OOP background. I was Googling around and it looks like what I want in Rust would be like making a bot manager which calls a function that has a callback to the manager of when it guesses which checks it against the secret number there?

Code: https://blazebin.io/basic/viewer/uupzvevcbzcv/0

[sand gust]

What I would suggest is to define a separate type for the bot:

struct Bot {
    min_num: u32,
    max_num: u32,
}

impl Bot {
    fn current_guess(&self) -> u32 { ... }

    fn your_guess_was(&mut self, correct: bool) { ... }
}

Then the Bot code does not have access to any of the game state except itself.

(Note that this is just encapsulation for when the rules of the language are being followed, not security — the bot could use unsafe code to peek into what the rest of the program is doing.)

Note that it's not critical that there is a declared type, actually, but just that there are functions. The type is a convenience for passing data to the functions.

@onyx cobalt