better handling for pointer in AutoMap

api.go

@@ -3,6 +3,7 @@ package structmapper
 import (
 	"encoding/json"
 	"fmt"
+	"reflect"
 
 	di "git.apihub24.de/admin/generic-di"
 	"git.apihub24.de/admin/structmapper/utils"
@@ -52,10 +53,14 @@ func SliceMap[TFrom any, TTo any](from []TFrom) []TTo {
 
 func AutoMap[TFrom any, TTo any](from TFrom) (TTo, error) {
 	var result TTo
+	resultValue := reflect.ValueOf(&result).Elem()
+	if resultValue.Kind() == reflect.Ptr {
+		resultValue.Set(reflect.New(resultValue.Type().Elem()))
+	}
 	str, err := json.Marshal(from)
 	if err != nil {
 		return result, err
 	}
-	_ = json.Unmarshal(str, &result)
-	return result, nil
+	err = json.Unmarshal(str, resultValue.Addr().Interface())
+	return result, err
 }