blob: 6e40913277f8573d95e81af8c73a888a00fe2956 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
/* 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>=shapes.size())
return NULL;
return shapes[idx];
}
Shape* ShapeOwner::remove(int idx) // this method returns memory which must be deleted
{
if (idx<0 || idx>=shapes.size())
return NULL;
Shape* ptr=shapes[idx];
shapes.erase(shapes.begin()+idx);
return ptr;
}
|