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Create an object at a given address: Difference between revisions
Create an object at a given address (view source)
Revision as of 22:25, 10 December 2016
, 7 years ago→{{header|Racket}}
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;; object
</lang>
=={{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>
=={{header|Tcl}}==
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