the address where the value should be copied to. This should always correspond to the BASE + OFFSET + INDEX * SIZE, where BASE = (for member properties) the address of the UObject which contains this data, (for locals/parameters) the address of the space allocated for the function's locals OFFSET = the Offset of this FProperty INDEX = the index that you want to copy. for properties which are not arrays, this should always be 0 SIZE = the ElementSize of this FProperty