Create an object at a given address: Difference between revisions

=={{header|Rust}}==

In a real program, most if not all of the contents of main would all be in one `unsafe` block, however in this one each unsafe operation gets its own block to emphasize exactly which actions Rust considers unsafe.

<lang rust>use std::{mem,ptr};

fn main() {

let mut data: i32;

// Rust does not allow us to use uninitialized memory but the STL provides an `unsafe`

// function to override this protection.

unsafe {data = mem::uninitialized()}

// Construct a raw pointer (perfectly safe)

let address = &mut data as *mut _;

unsafe {ptr::write(address, 5)}

println!("{0:p}: {0}", &data);

unsafe {ptr::write(address, 6)}

println!("{0:p}: {0}", &data);

}</lang>