4elist1014.cpp

《21天学通C＋＋》附盘的原代码。书上的每个例子在这里都有相应的C语言程序。

// Listing 10.14
//Overload operator plus (+)

#include <iostream>

using namespace std;

class Counter
{
public:
	Counter();
	Counter(int initialValue);
	~Counter(){}
	int GetItsVal()const { return itsVal; }
	void SetItsVal(int x) {itsVal = x; }
	Counter operator+ (const Counter &);
private:
	int itsVal;
};

Counter::Counter(int initialValue):
itsVal(initialValue)
{}

Counter::Counter():
itsVal(0)
{}

Counter Counter::operator+ (const Counter & rhs)
{
	return Counter(itsVal + rhs.GetItsVal());
}

int main()
{
	Counter varOne(2), varTwo(4), varThree;
	varThree = varOne + varTwo;
	cout << "varOne: " << varOne.GetItsVal()<< endl;
	cout << "varTwo: " << varTwo.GetItsVal() << endl;
	cout << "varThree: " << varThree.GetItsVal() << endl;

	return 0;
}