[C++知识库]C++类和对象一些表示方式此节主要涉及对函数指针的应用

头文件：

#pragma once
#include<iostream>
#include<string>
using namespace std;
class book
{
public:
	void initData(string Xname, int Xprice, int Xnum);
	void print();
	string& getName()//第二种赋值方法
	{
		return m_name;
	}
	int& getNum()
	{
		return m_num;
	}
	int& getPrice()
	{
		return m_price;
	}
protected:
	string m_name="三国";
	int m_price=20;
	int m_num=201;
private:

};

源文件：

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#include "book.h"
void book::print()
{
	cout << m_name << "\t" << m_num << "\t" << m_price << endl;
}
void book::initData(string Xname, int Xprice, int Xnum)
{
	m_name = Xname;
	m_num = Xnum;
	m_price = Xprice;
}
int main()
{
	book BOOK;
	BOOK.print();
	BOOK.initData("水浒", 21, 202);//一种赋值保护类的方法
	BOOK.print();
	BOOK.getName() = "红楼梦";
	BOOK.getNum() = 203;
	BOOK.getPrice() = 23;
	BOOK.print();
	//*函数指针代表整个函数名
	//book:: 修饰*函数指针
	void (book:: * p)() = &book::print;
	//(类的对象.*指针)(参数)//调用指针函数
	(BOOK.*p)();


	book* pbook= new book;
	//(对象指针->*指针)(参数)
	(pbook->*p)();
	auto pp = &book::print;
	(BOOK.*pp)();
	return 0;
}