Pointer Primitives

Raw pointers (*const T และ *mut T)

Creating Raw Pointers

fn main() {
    let x = 42;

    // Create raw pointer from reference
    let ptr: *const i32 = &x as *const i32;
    println!("Pointer: {:p}", ptr);

    // Shorthand with coercion
    let ptr: *const i32 = &x;

    // Mutable pointer
    let mut y = 100;
    let ptr_mut: *mut i32 = &mut y;

    // Dereference requires unsafe
    unsafe {
        println!("*ptr = {}", *ptr);
        *ptr_mut = 200;
        println!("*ptr_mut = {}", *ptr_mut);
    }

    // Null pointers
    let null: *const i32 = std::ptr::null();
    let null_mut: *mut i32 = std::ptr::null_mut();

    println!("null.is_null(): {}", null.is_null());
    println!("null_mut.is_null(): {}", null_mut.is_null());

    // From integer (very unsafe!)
    let addr = 0x1234usize;
    let ptr_from_int = addr as *const i32;
    println!("From addr: {:p}", ptr_from_int);
}