widwork.h

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#ifndef WIDWORK_H_INCLUDED
#define WIDWORK_H_INCLUDED
 
#include <list>
#include <functional>
#include <iostream>
    
class  Widget {
public:
    Widget (int a = 0) : id (a)
        { }
 
    void operator= (const Widget& rhs) {
        id = rhs.id;
    }
 
    friend std::ostream& operator<< ( std::ostream&, const Widget& );
    int id;
};
 
typedef std::list<Widget, std::allocator<Widget> > widgetList;
typedef std::list<int, std::allocator<int> >       idList;
 
struct WidgetTester : std::binary_function<Widget, int, bool> 
{
public:
    bool operator () (const Widget & wid, int testid) const;
};
 
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:
    widgetList on_hand;
    idList     on_order;
};
 
 
#endif   // WIDWORK_H_INCLUDED