golang 内存对齐问题 记录

• eg 1:

   1 package main
   2        
   3 import (
   4     "fmt"
   5     "unsafe"
   6 )   
   7        
   8 func main() {
   9     fmt.Printf("%d\n",unsafe.Sizeof(struct {
  10         a  byte                                                                                                                                       
  11         i8 int 
  12         b  byte
  13     }{}))
  14 }   

  结果：24

• eg 2:

   1 package main
   2             
   3 import ( 
   4     "fmt"
   5     "unsafe"
   6 )           
   7             
   8 func main() {
   9     fmt.Printf("%d\n",unsafe.Sizeof(struct {
  10         i8 int 
  11         a  byte                                                                                                                                       
  12         b  byte
  13     }{}))
  14 }

• 结果：16