Pin Module

Pin และ Unpin สำหรับ memory safety

Pin Basics

use std::pin::Pin;
use std::marker::PhantomPinned;

fn main() {
    // Pin wraps a pointer type
    println!("=== Pin<P> ===");
    println!("P can be: &T, &mut T, Box<T>, Rc<T>, Arc<T>");
    println!();

    // Most types are Unpin - safe to move
    let mut x = 42;
    let pinned: Pin<&mut i32> = Pin::new(&mut x);

    println!("i32 is Unpin: pinned value = {}", *pinned);

    // Can get mutable access for Unpin types
    let inner: &mut i32 = pinned.get_mut();
    *inner = 100;
    println!("Modified: {}", *inner);

    // Box::pin for heap allocation
    let boxed: Pin<Box<String>> = Box::pin(String::from("hello"));
    println!("\nBox::pin: {}", boxed);

    // Pin::into_inner for Unpin types
    let pinned = Pin::new(&42);
    let _inner = Pin::into_inner(pinned);
}