/* File : example.c */



#include "example.h"

#include <stdio.h>



#define M_PI 3.14159265358979323846



/* Move the shape to a new location */

void Shape::move(double dx, double dy) {

  x += dx;

  y += dy;

}



int Shape::nshapes = 0;



double Circle::area(void) {

  return M_PI*radius*radius;

}



double Circle::perimeter(void) {

  return 2*M_PI*radius;

}



double Square::area(void) {

  return width*width;

}



double Square::perimeter(void) {

  return 4*width;

}



Circle* createCircle(double w)

{

    return new Circle(w);

}



Square* createSquare(double w)

{

    return new Square(w);

}



ShapeOwner::ShapeOwner() {printf("  ShapeOwner(%p)\n",this);}

ShapeOwner::~ShapeOwner()

{

    printf("  ~ShapeOwner(%p)\n",this);

    for(unsigned i=0;i<shapes.size();i++)

        delete shapes[i];

}



void ShapeOwner::add(Shape* ptr) // this method takes ownership of the object

{

    shapes.push_back(ptr);

}



Shape* ShapeOwner::get(int idx) // this pointer is still owned by the class (assessor)

{

    if (idx < 0 || idx >= static_cast<int>(shapes.size()))

        return NULL;

    return shapes[idx];

}



Shape* ShapeOwner::remove(int idx) // this method returns memory which must be deleted

{

    if (idx < 0 || idx >= static_cast<int>(shapes.size()))

        return NULL;

    Shape* ptr=shapes[idx];

    shapes.erase(shapes.begin()+idx);

    return ptr;

}