Function std::ptr::read

pub unsafe fn read<T>(src: *const T) -> T

Reads the value from src without moving it. This leaves the memory in src unchanged.

Safety

Beyond accepting a raw pointer, this is unsafe because it semantically moves the value out of src without preventing further usage of src. If T is not Copy, then care must be taken to ensure that the value at src is not used before the data is overwritten again (e.g. with write, zero_memory, or copy_memory). Note that *src = foo counts as a use because it will attempt to drop the value previously at *src.

Examples

Basic usage:

fn main() { let x = 12; let y = &x as *const i32; unsafe { println!("{}", std::ptr::read(y)); } }

let x = 12;
let y = &x as *const i32;

unsafe { println!("{}", std::ptr::read(y)); }