int64 representation in bytes

readme.md

example

main.go

package main

import (
	"fmt"
	"unsafe"
	"reflect"
)

func main() {
	var n uint64 = 1 << (1 << 6) - 1
	fmt.Println(n)
	sh := &reflect.SliceHeader{
		Data: uintptr(unsafe.Pointer(&n)),
		Len: 1 << 3,
		Cap: 1 << 3,
	}
	sb := *(*[]byte)(unsafe.Pointer(sh))
	fmt.Println(sb)
	for i, _ := range sb {
		if i == 0 {continue}
		sb[i] = 0
	}
	fmt.Println(sb)
	*sh = *(*reflect.SliceHeader)(unsafe.Pointer(&sb))
	n = *(*uint64)(unsafe.Pointer(sh.Data))
	fmt.Println(n)
}
/**
  18446744073709551615
  [255 255 255 255 255 255 255 255]
  [255 0 0 0 0 0 0 0]
  255
**/