Drop trait for custom cleanup logic

801 views

                  struct Logger {
    name: String,
}

impl Drop for Logger {
    fn drop(&mut self) {
        println!("{} is being dropped", self.name);
    }
}

fn main() {
    let _logger = Logger { name: "MyLogger".to_string() };
    println!("End of main");
} // Logger dropped here

The Drop trait runs when a value goes out of scope, similar to destructors in C++. I implement Drop for resource handles: closing file descriptors, releasing locks, or logging cleanup. The drop method takes &mut self and can't fail (no Result). Rust calls Drop automatically; you rarely call it manually (use std::mem::drop() for explicit drops). Drop order is deterministic: values are dropped in reverse order of creation. For async cleanup, Drop can't call async functions, so I use a separate async fn shutdown() method. Drop is essential for RAII (Resource Acquisition Is Initialization), ensuring resources are freed even on panic.

Marcus Chen

More from Marcus Chen

Drop trait for custom cleanup logic

0 Comments

More from Marcus Chen