Rust for C-Programmers

10.9 Enums as the Basis for Option and Result

Rust's standard library uses enums extensively, particularly for the Option and Result types.

10.9.1 The Option Enum

#![allow(unused)]
fn main() {
enum Option<T> {
    Some(T),
    None,
}
}

• Usage: Represents an optional value.
• Pattern Matching: Used to safely handle cases where a value may be absent.

10.9.2 The Result Enum

#![allow(unused)]
fn main() {
enum Result<T, E> {
    Ok(T),
    Err(E),
}
}

• Usage: Used for error handling.
• Pattern Matching: Allows handling success and error cases explicitly.

Note: We will explore Option, Result, and error handling in detail in later chapters.