顯示原始指標

Rust 有一個指標型別的預設格式化程式，可用於顯示指標。

use std::ptr;

// Create some data, a raw pointer pointing to it and a null pointer
let data: u32 = 42;
let raw_ptr = &data as *const u32;
let null_ptr = ptr::null() as *const u32;

// the {:p} mapping shows pointer values as hexadecimal memory addresses
println!("Data address: {:p}", &data);
println!("Raw pointer address: {:p}", raw_ptr); 
println!("Null pointer address: {:p}", null_ptr);

這將輸出如下內容：

Data address: 0x7fff59f6bcc0
Raw pointer address: 0x7fff59f6bcc0
Null pointer address: 0x0