Effective-CPP-Programs/Item10.cpp at master · ardbytes/Effective-CPP-Programs · GitHub

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
// Item 10: Have assignment operators return a reference to *this
#include <iostream>
using namespace::std;

class Animal
{
 private:
 	int agility;
 public:

	/* Its a convention that assignment operators accepting any unconventional
	 * parameter type return a reference to *this.
	 */
 	Animal& operator=(const Animal& rhs);
	Animal& operator=(int agility);
	Animal& operator+=(const Animal& rhs);

	operator int();
};

Animal::operator int()
{
 return this->agility;
}

Animal& Animal::operator=(const Animal& rhs)
{
 this->agility = rhs.agility;
 return *this;
}

Animal& Animal::operator=(int agility)
{
 this->agility = agility;
 return *this;
}

Animal& Animal::operator+=(const Animal& rhs)
{
 this->agility += rhs.agility;
 return *this;
}


int main()
{
 Animal genX;
 Animal genY;
 Animal genZ;
 genX = 10;
 genZ = 20;
 genY = genX;
 genZ += genY;

 cout << genX << endl;
 cout << genY << endl;
 cout << genZ << endl;
}