类的定义2

#include <iostream>
#include <string>

using namespace std;

class Screen
{
public:
	typedef std::string::size_type index; // 用index代替所有的std::string::size_type就是使用类型别名简化类，

	Screen(index ht = 0, index wd = 0) :contents(ht * wd, 'X'), cursor(0), height(ht), width(wd)
	{ }

	Screen(index ht, index wd, const std::string &conts);

	char get() const;  // get() 是成员函数是可以被重载的，函数声明在类的内部，
	/*{
		return contents[cursor];
	}*/
	//char get(std::string::size_type r, std::string::size_type c) const
	inline char get(index r, index c) const;
	/*{
		index row = r * width;
		return contents[row + c];
	}*/
private:
	std::string contents;
	index cursor; // cursor 是光标的位置，
	index height,width;
};

Screen::Screen(index ht, index wd, const std::string &conts) :contents(conts), cursor(0), height(ht), width(wd)
{}

inline char Screen::get() const  // 函数的定义在类的外部，显示指定inline 成员函数，
{
	return contents[cursor];
}

char Screen::get(index r, index c) const
{
	index row = r * width;
	return contents[row + c];
}

int main()
{
	Screen a(10,100);
	cout << a.get() << endl;
	cout << a.get(2, 7) << endl;
	cout << endl;

	Screen b(3, 6, "hello xiaoo cuicui");
	cout << b.get() << endl;
	cout << b.get(2, 4) << endl;

	Screen::index ind;

	cout << "小崔，生日快乐。" << endl;

	return 0;
}