540.3. Unless the taxpayer has included any portion of the gain or loss, otherwise determined, from the disposition of the exchanged foreign share in computing the taxpayer’s income for the taxation year in which the exchange occurred, the taxpayer is deemed to have disposed of the exchanged foreign share for proceeds of disposition equal to the adjusted cost base of the share to the taxpayer immediately before the exchange and to have acquired the share issued in exchange at a cost equal to such adjusted cost base.