[]运算符重载 .txt

//中括号重载
#include<iostream>
#include<string>
struct Person
{
	std::string name;
	double salary;
};
class employee
{
private:
	Person *p;
	int max;//职工最大数量
	int num;//实际员工数量
public:
	employee(int a=0) 
	{
		max = a;
		num = 0; 
		p = new Person[max];

	};
	~employee() 
	{
		delete[] p;
	}
	//创建[]的重载，使得下标使用之后能够返回对应薪水的引用
	double& operator [](std::string a);
	void display();
};
void employee::display()
{
	std::cout << "--------------------" << std::endl;
	for (int i = 0; i < max; ++i)
	{
		std::cout << (p+i)->name << "--" <<(p+i)->salary<< std::endl;
	}
}
double& employee::operator[](std::string a)
{
	Person* p1;
	//数组存在里面的东西
	for (p1 = p;p1 >= p+max;++p1)
		if (a == p1->name)return p->salary;
	//不存在的情况
	p1 = p+num++;
	p1->name = a;
	p1->salary = 0;
	return p1->salary;
}
int main()
{
	employee a(3);
	a["王一"] = 123.3123;
	a["王二"] = 123.123;
	a["王三"] = 354.345;
	a.display();

}