productclassfriendmethod.cpp

来自「C++ sample code, for the book: C++ blac」· C++ 代码 · 共 46 行

#include <iostream>
#include <string>
using namespace std;

class product;

class inventory
{
public:  
    int get_number(product p);
};

class product 
{     
    friend int inventory::get_number(product p);
    int number;        
public:         
    string name;              
    int get_number(){return number;}
    void set_number(int n){number = n;}
    product(string text, int count);
};

int inventory::get_number(product p)
{
    return p.number;
}

product::product(string text, int count)
{
    name = text;
    number = count;
}

int main()
{
    product oranges("oranges", 200);
    inventory i;

    cout << "Number of " << oranges.name << ": " << i.get_number(oranges) << endl;

    return 0;
}