util_storr_factory function

Create a storr object with a storr_factory attribute

also does basic validity checks

util_storr_factory(my_storr_object, my_storr_factory)

Arguments

• my_storr_object: a storr-object
• my_storr_factory: a function creating the/a storr_object

Returns

storr-object with the factory attribute and (hopefully) valid.