Zero-Copy-String zu Slice-Inspektion mittels Unsafe-Pointer-Speicherprimitiven

package main
 
import (
	"fmt"
	"reflect"
	"unsafe"
)
 
func readOnlyByteView(s string) []byte {
	if len(s) == 0 {
		return nil
	}
	return unsafe.Slice(unsafe.StringData(s), len(s))
}
 
func inspectSliceHeader(b []byte) (uintptr, int, int) {
	hdr := (*reflect.SliceHeader)(unsafe.Pointer(&b))
	return hdr.Data, hdr.Len, hdr.Cap
}
 
func main() {
	str := "Immutable Memory String"
	view := readOnlyByteView(str)
	ptr, l, c := inspectSliceHeader(view)
	fmt.Printf("Address: 0x%x, Length: %d, Capacity: %d\n", ptr, l, c)
	fmt.Printf("Content: %s\n", string(view))
}