rust 裸指针_rust 裸指针 非copy

fn main() {
 
    let mut foo1 = String::from("1asdasdasd");
    let foollmut = &mut foo1;
    let pointer = foollmut as *mut String;
 
    let points_at1 = unsafe { &*pointer };    
    println!("points_at1 {}", points_at1);
 
 
    let x = 5;
    let raw = &x as *const i32;
    //当你解引用一个裸指针，你要为它并不指向正确的地方负责。为此，你需要unsafe：
    let points_at = unsafe { *raw };      
    println!("raw points at {}", points_at);
 
}

fn main() {
    let a = 3.1 as i8;
    let b = 100_i8 as i32;
    let c = 'a' as u8; // 将字符'a'转换为整数，97
 
    println!("{},{},{}",a,b,c);
 
 
    let mut values: [i32; 2] = [1, 2];
    let p1: *mut i32 = values.as_mut_ptr();
    let first_address = p1 as usize; // 将p1内存地址转换为一个整数
    let second_address = first_address + 4; // 4 == std::mem::size_of::<i32>()，i32类型占用4个字节，因此将内存地址 + 4
    let p2 = second_address as *mut i32; // 访问该地址指向的下一个整数p2
    unsafe {
        *p2 += 1;
    }
    assert_eq!(values[1], 3);
 
    let mut a = 1;
    let aco = &mut a as *mut i32;
    // let aco1 = aco as usize;
 
    unsafe {
        *aco += 1;
    }
    println!("aco0------{}",a);
 }