// SPDX-License-Identifier: Apache-2.0 OR MIT use pin_init::*; // Struct with size over 1GiB #[derive(Debug)] pub struct BigStruct { buf: [u8; 1024 * 1024 * 1024], a: u64, b: u64, c: u64, d: u64, managed_buf: ManagedBuf, } #[derive(Debug)] pub struct ManagedBuf { buf: [u8; 1024 * 1024], } impl ManagedBuf { pub fn new() -> impl Init<Self> { init!(ManagedBuf { buf <- zeroed() }) } } fn main() { // we want to initialize the struct in-place, otherwise we would get a stackoverflow let buf: Box<BigStruct> = Box::init(init!(BigStruct { buf <- zeroed(), a: 7, b: 186, c: 7789, d: 34, managed_buf <- ManagedBuf::new(), })) .unwrap(); println!("{}", core::mem::size_of_val(&*buf)); }