type W struct {
b byte
i int32
j int64
}
type W2 struct {
name string
age int32
}
var w W
var w2 W2
fmt.Println(unsafe.Sizeof(w), unsafe.Sizeof(w2))for the w variable, I know the memory footprint should be 16, but why is w2 24? Ask for advice
I read that unsafe.Sizeof (), string is 16 int32 is 4, press 8 alignment, you are 24
import "fmt"
import "unsafe"
func main() {
var bs []byte
fmt.Println("[]byte:", unsafe.Sizeof(bs))
var str string
fmt.Println("string:", unsafe.Sizeof(str))
var i64 int64
fmt.Println("int64:", unsafe.Sizeof(i64))
var i32 int64
fmt.Println("int32:", unsafe.Sizeof(i32))
var stru struct{}
fmt.Println("struct:", unsafe.Sizeof(stru))
} this is written on the document
Sizeof takes an expression x of any type and returns the size in bytes of a hypothetical variable v as if v was declared via var v = x. The size does not include any memory possibly referenced by x. For instance, if x is a slice, Sizeof returns the size of the slice descriptor , not the size of the memory referenced by the slice.
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