wiki/content/20200929142932-drop_trait.md

date	id	title
2020-09-29	a5820942-f47a-4a5e-ba83-33916cc24674	Drop Trait

Introduction

Drop lets you customize what happens when a value is about to go out of scope, ie: to release resources like files or network connections.

Example

struct CustomSmartPointer {
    data: String,
}

impl Drop for CustomSmartPointer {
    fn drop(&mut self) {
        println!("Dropping CustomSmartPointer with data `{}`!", self.data);
    }
}

fn main() {
    let _c = CustomSmartPointer {
        data: String::from("my stuff"),
    };
    let _d = CustomSmartPointer {
        data: String::from("other stuff"),
    };
    println!("CustomSmartPointers created.");
}