- TBD
unsafe powers
- Dereference a raw pointer
- Call an unsafe function or method
- Access or modify a mutable static variable
- Implement an unsafe trait
- Access fields of a union
examples/unsafe/unsafe-demo/src/main.rs
fn main() { let mut text = String::from("abcd"); println!("{text}"); let pointer: *mut String = &mut text as *mut String; // mutable raw pointer println!("pointer is: {:?}", pointer); println!("addr_of: {:?}", std::ptr::addr_of!(text)); unsafe { // pointer.offset(count); println!("pointer+1 is: {:?}", pointer.offset(1)); println!("pointer is: {}", *pointer); //println!("ptr is: {}", *ptr.offset(1)); } println!("{text}"); // let address = 0x012345usize; // let r = address as *const i32; // println!("{r:?}"); //safe_increment(); // unsafe_increment(); } // fn safe_increment() { // let mut num = 5; // let r1 = # // num += 1; // println!("{num}"); // println!("{r1}"); // } // fn unsafe_increment() { // let mut num = 5; // let r1 = &num as *const i32; // immutable raw pointer // let r2 = &mut num as *mut i32; // mutable raw pointer // println!("r1 is: {:?}", r1); // println!("r2 is: {:?}", r2); // unsafe { // println!("r1 is: {}", *r1); // println!("r2 is: {}", *r2); // *r2 += 1; // } // println!("{num}"); // }