productclassnew.cpp

来自「C++ sample code, for the book: C++ blac」· C++ 代码 · 共 48 行

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

class product 
{     
    int number;        
public:         
    string name;              
    int get_number(){return number;}
    product(string text, int count);
    void *operator new(size_t size);
    void operator delete(void *p);
};

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

void *product::operator new(size_t size)
{
    cout << "Allocating memory..." << endl;
    void *p = new char[size];
    return p;
}

void product::operator delete(void *p)
{
    cout << "Deleting memory..." << endl;
    delete[] (void *) p;
}

int main()
{
    product *orange_pointer = new product("oranges", 200);

    cout << "Number of " << orange_pointer->name << ": " 
        << orange_pointer->get_number() << endl;

    delete orange_pointer;

    return 0;
}