1 // SPDX-License-Identifier: Apache-2.0 OR MIT 2 3 use pin_init::*; 4 5 // Struct with size over 1GiB 6 #[derive(Debug)] 7 pub struct BigStruct { 8 buf: [u8; 1024 * 1024 * 1024], 9 a: u64, 10 b: u64, 11 c: u64, 12 d: u64, 13 managed_buf: ManagedBuf, 14 } 15 16 #[derive(Debug)] 17 pub struct ManagedBuf { 18 buf: [u8; 1024 * 1024], 19 } 20 21 impl ManagedBuf { 22 pub fn new() -> impl Init<Self> { 23 init!(ManagedBuf { buf <- zeroed() }) 24 } 25 } 26 27 fn main() { 28 // we want to initialize the struct in-place, otherwise we would get a stackoverflow 29 let buf: Box<BigStruct> = Box::init(init!(BigStruct { 30 buf <- zeroed(), 31 a: 7, 32 b: 186, 33 c: 7789, 34 d: 34, 35 managed_buf <- ManagedBuf::new(), 36 })) 37 .unwrap(); 38 println!("{}", core::mem::size_of_val(&*buf)); 39 } 40