Function tao_of_rust::ch04::general_concepts::memory_layout

pub fn memory_layout()

复合结构内存布局

Base usage: 结构体内存对齐

struct A {
    a: u32,
    b: Box<u64>,
}
struct B(i32, f64, char);
struct N;
enum E {
    H(u32),
    M(Box<u32>)
}
union U {
    u: u32,
    v: u64
}
fn main(){
    println!("Box<u32>: {:?}", std::mem::size_of::<Box<u32>>());
    println!("A: {:?}", std::mem::size_of::<A>());
    println!("B: {:?}", std::mem::size_of::<B>());
    println!("N: {:?}", std::mem::size_of::<N>());
    println!("E: {:?}", std::mem::size_of::<E>());
    println!("U: {:?}", std::mem::size_of::<U>());
}