package main

import (
    "fmt"
    "unsafe"
)
// mem align
type Person struct {
    a byte
    b int32
    c int64
}

type Person2 struct {
    a byte
    b int64
    c int32
}

func main() {
    p := Person{}
    fmt.Println(unsafe.Alignof(p)) // 8
    fmt.Println(unsafe.Sizeof(p))  // 16

    p2 := Person2{}
    fmt.Println(unsafe.Alignof(p2)) // 8
    fmt.Println(unsafe.Sizeof(p2))  // 24
}