66 lines
1.1 KiB
Rust
66 lines
1.1 KiB
Rust
use std::slice;
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unsafe fn dangerous() {
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}
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fn split_at_mut(slice: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
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let len = slice.len();
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let ptr = slice.as_mut_ptr();
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assert!(mid <= len);
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unsafe {
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(
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slice::from_raw_parts_mut(ptr, mid),
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slice::from_raw_parts_mut(ptr.add(mid), len - mid),
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)
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}
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}
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extern "C" {
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fn abs(input: i32) -> i32;
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}
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static mut COUNTER: u32 = 0;
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fn add_to_count(inc: u32) {
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unsafe {
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COUNTER += inc;
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}
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}
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fn main() {
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let mut num = 5;
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let r1 = &num as *const i32;
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let r2 = &mut num as *mut i32;
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unsafe {
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println!("r1 is: {}", *r1);
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println!("r2 is: {}", *r2);
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}
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unsafe {
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dangerous();
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}
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let mut v = vec![1, 2, 3, 4, 5, 6];
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let r = &mut v[..];
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let (a, b) = split_at_mut(r, 3);
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assert_eq!(a, &mut [1, 2, 3]);
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assert_eq!(b, &mut [4, 5, 6]);
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unsafe {
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println!("Absolute value of -3 according to C: {}", abs(-3));
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}
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add_to_count(3);
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unsafe {
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println!("COUNTER: {}", COUNTER);
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}
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}
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