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PC World Komputer 1997 May
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WIDWORK.CPP
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C/C++ Source or Header
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1997-02-28
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/**************************************************************************
*
* widwork.cpp - widget words, from Chapter 6.3
*
* $Id: widwork.cpp,v 1.3 1995/08/29 19:03:58 oberg Exp $
*
* $$RW_INSERT_HEADER "slyrs.cpp"
*
**************************************************************************/
# include <list>
# include <algorithm>
# include <iostream.h>
using namespace std;
class Widget {
public:
int id;
Widget(int a = 0) : id(a) { }
void operator= (const Widget& rhs) { id = rhs.id; }
friend ostream & operator << (ostream & out, const Widget & w)
{ return out << "Widget " << w.id; }
bool operator== (const Widget & rhs)
{ return id == rhs.id; }
bool operator< (const Widget & rhs)
{ return id < rhs.id; }
};
struct WidgetTester : binary_function<Widget, int, bool> {
public:
bool operator () (const Widget & wid, int testid) const
{ return wid.id == testid; }
};
class inventory {
public:
void order (int wid); // process order for widget type wid
void receive (int wid); // receive widget of type wid in shipment
private:
list<Widget> on_hand;
list<int> on_order;
};
void inventory::order (int wid)
{
cout << "Received order for widget type " << wid << endl;
list<Widget>::iterator wehave = find_if(on_hand.begin(), on_hand.end(),
bind2nd(WidgetTester(), wid));
if (wehave != on_hand.end()) {
cout << "Ship " << *wehave << endl;
on_hand.erase(wehave);
}
else {
cout << "Back order widget of type " << wid << endl;
on_order.push_front(wid);
}
}
void inventory::receive (int wid)
{
cout << "Received shipment of widget type " << wid << endl;
list<int>::iterator weneed = find(on_order.begin(), on_order.end(), wid);
if (weneed != on_order.end()) {
cout << "Ship " << Widget(wid) << " to fill back order" << endl;
on_order.erase(weneed);
}
else
on_hand.push_front(Widget(wid));
}
int main() {
cout << "Widget Works test program" << endl;
inventory stock;
stock.receive(1);
stock.receive(2);
stock.receive(3);
stock.order(2);
stock.order(2);
stock.order(3);
stock.receive(2);
cout << "End of widget words test program" << endl;
return 0;
}