Hello,
I was wondering if someone could help me understand what is going on in the
following piece of code.
package main
import (
"fmt"
"reflect"
"unsafe"
)
func main() {
a := []byte("1234567")
printSliceDetails(a)
}
func printSliceDetails(a []byte) {
sliceHeader := (*reflect.SliceHeader)(unsafe.Pointer(&a))
fmt.Printf("Backing array location: %v, data: %s, len: %d, cap: %d\n",
sliceHeader.Data, string(a), len(a), cap(a))
// fmt.Printf("Backing array location: %v, data: %s, len: %d, cap: %d\n",
// sliceHeader, string(a), len(a), cap(a))
}
In the above code, the capacity prints 32. However, if you comment the
first print statement and remove the commenting on the second and run the
program again the capacity will only be 8. What is happening with
sliceHeader.Data to make its capacity grow like that?
Thanks,
Farley
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