rustHow to free box memory in Rust

Rust provides a number of ways to free memory.

1. Drop: The drop function is used to free memory associated with a variable. It is called automatically when a variable goes out of scope.

let x = Box::new(5);
drop(x);

2. Manually: Memory can also be manually freed using the std::mem::drop function.

let x = Box::new(5);
std::mem::drop(x);

3. std::mem::forget: The std::mem::forget function can be used to manually free memory without calling the drop function.

let x = Box::new(5);
std::mem::forget(x);

4. std::mem::replace: The std::mem::replace function can be used to replace a variable with a new value and free the memory associated with the old value.

let mut x = Box::new(5);
std::mem::replace(&mut x, Box::new(6));

5. std::mem::swap: The std::mem::swap function can be used to swap two variables and free the memory associated with the old values.

let mut x = Box::new(5);
let mut y = Box::new(6);
std::mem::swap(&mut x, &mut y);

These functions can be used to free memory in Rust.

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