For lab $6,$ you need to:

Create a drawing application so the user can add different kinds of shapes to a canvas. All these shapes have a few things in common, like background color, border and so on$.$

As your exercise,

$1.$ Create a new class. Shape and let two classes: Rectangle and Circle derive from the Shape class.

$2.$ For each class you should implement the member functions in the implementation file.

$3.$ Add a function to base class. The function is draw$().$ Let two derived classes override this function.

$4.$ Back to the main file, create a function called showShape$().$ Pass a Shape object as the argument and draw shape for implementation.

$5.$ Use Polymorphic Collection $($I am not sure what this is$).$ Create a vector of Shape, put a rectangle and a circle into it$,$ loop over the vector, and draw a rectangle and a circle on the console. Use late or dynamic binding $($which I also need help understanding$).$

$6.$ Rewrite this code using unique pointer instead.

Here are the UMLs.

Shape UML:

$-$background: string

$+$getBackground$()$

$+$setBackground$()$

$+$void draw$()$

Rectangle UML:

$-$width: int

$-$heigth: int

$+$Rectangle$()$

$+$Rectangle$($int width, int height$)$

$+$void draw$()$

$+$int getArea$()$

Circle UML:

$-$radius: float

$+$Circle$()$

$+$Circle$($float radius$)$

$+$float getArea$()$

$+$void draw$()$

I want to try to get the following code to work.

vector $>$ uniqueShapes;

$//$Since this is a vector of unique Shape pointers, it cannot use rectangle or circle pointers.

$//$I was accidentally trying to downcast a shape to a rectangle and a circle $($which is illegal$).$

unique$\_$ptr rectanglePtr $=$ make$\_$unique $(4\mathrm{.}0,5\mathrm{.}0)$;

unique$\_$ptr circlePtr $=$ make$\_$unique $(6\mathrm{.}0)$;

uniqueShapes.push$\_$back$($rectanglePtr$)$;

uniqueShapes.push$\_$back$($circlePtr$)$;

The four lines above are what is causing the problem. It says something about trying to access a deleted function.

uniqueShapes.push$\_$back$($make$\_$unique $(7\mathrm{.}0,8\mathrm{.}0))$;

uniqueShapes.push$\_$back$($make$\_$unique $(9\mathrm{.}0))$;

for $($int i $=0$; i $<$ uniqueShapes.size$()$; i$++)$

$\{$

showShape$($shapes$.$at$($i$))$;

$\}$

What am I doing wrong?