rustVec及struct结构体的相互转化

　　#[derive(Debug, Clone)] struct Rectangle {     x: i32,     y: i32, }  impl Rectangle {     fn area(&self) -> i32 {         self.x * self.y     }      fn perimeter(&self) -> i32 {         2 * (self.x + self.y)     } }  pub fn value_to_u8(value: T) -> Vec {     let ptr = unsafe { std::mem::transmute::<&T, *const u8>(&value) };     unsafe { std::slice::from_raw_parts(ptr, std::mem::size_of::()).to_vec() } }  pub fn u8_to_value(data_vec_u8: Vec) -> T {     unsafe {         std::ptr::read(data_vec_u8.as_ptr() as *const _)     } }  fn main() {     let rectangle = Rectangle {         x: 60,         y: 80,     };     println!(＂struct_data = {:?}＂, rectangle);      // struct 转化为 Vec     let data_vec_u8 = value_to_u8(rectangle);     println!(＂data_vec_u8 = {:?}＂, data_vec_u8);          // Vec 转化为 struct     let res_data = u8_to_value::(data_vec_u8);     println!(＂result_data = {:?}＂, res_data);      // 计算     println!(＂area = {}＂, res_data.area());     println!(＂perimeter = {}＂, res_data.perimeter()); }