Przypisanie zmiennej nullptr do oryginalnej zmiennej

void transferItem( Item * item, Inventory * from, Inventory * to ) {
    from->removeItem( item );
   
    if( from->items.size() == 0 )
         from = nullptr; // usuwanie starego inventory
   
    to->addItem( item );
}

transferItem( item, currentInventory, player->bag );

void transferItem( Item * item, Inventory * & from, Inventory * to ) {
    //... reszta bez zmian
}

class Furniture
    : public GameObject
{
public:
    Texture * texture;
    sf::Sprite sprite;
   
    Inventory * inventory;
    Texture * takeItTexture;
    sf::Sprite takeItSprite; // draw a hand to take it
    bool showHand;
    // ...
};

Inventory * currentInventory;

void setInventoryPanel( Inventory * & i ) {
   
    currentInventory = i;
}

void transferItem( Item * item, Inventory * & from, Inventory * & to ) {
    from->removeItem( item->name );
   
    if( from->items.size() < 1 )
         from = nullptr; // delete empty inventory
   
    to->addItem( item );
}

// ...
// main

transferItem( currentInventory->items[ bagCursor ], currentInventory, player->bag );

if( inventory != nullptr && intersectionRectangleWithElipse( x2, y2, rx2, ry2, x1, y1, rx1, ry1 ) ) {
    showHand = true;
}
else {
    showHand = false;
}

void transferItem( Item * item, Inventory * & from, Inventory * & to ) {
    from->removeItem( item->name );
   
    if( from->items.size() < 1 )
         from = nullptr; // delete empty inventory
   
    to->addItem( item );
}