简洁对比

• 类对象

class Rate {
private:
	double _rate;
public:
	Rate(double rate):_rate(rate){}
	double operator()(double money,int year)
		{
		return money * _rate * year;
	}
};

 int main() {
	 double rate = 0.8;
	 Rate r1(rate);
	 double rd = r1(20000, 2);
	 cout << rd << endl;
 }

• lambda

auto n = [=](double m, int y)->double {return m * y * rate; };
 double rd2 = n(20000, 2);
 cout << rd2 << endl;

排序类型题目可省去一个bool比较方法。