visitortrashprototypeinit.cpp

Thingking in c++第二版

//: C09:VisitorTrashPrototypeInit.cpp {O}
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 2000
// Copyright notice in Copyright.txt
#include "Visitor.h"

std::vector<Trash*> Trash::prototypes;

class TrashPrototypeInit {
  Visitable<Aluminum> a;
  Visitable<Paper> p;
  Visitable<Glass> g;
  Visitable<Cardboard> c;
  TrashPrototypeInit() {
    Trash::prototypes.push_back(&a);
    Trash::prototypes.push_back(&p);
    Trash::prototypes.push_back(&g);
    Trash::prototypes.push_back(&c);
  }
  static TrashPrototypeInit singleton;
};

TrashPrototypeInit 
  TrashPrototypeInit::singleton; ///:~