建立和使用常量原始指標

// Let's take an arbitrary piece of data, a 4-byte integer in this case
let some_data: u32 = 14;

// Create a constant raw pointer pointing to the data above
let data_ptr: *const u32 = &some_data as *const u32;

// Note: creating a raw pointer is totally safe but dereferencing a raw pointer requires an
// unsafe block
unsafe {
    let deref_data: u32 = *data_ptr;
    println!("Dereferenced data: {}", deref_data);
}

上面的程式碼將輸出：Dereferenced data: 14