一个新的Factory，一个Creator以及它们的完美结合（二）

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没有办法，我弄不明白为什么我编辑得好好的文章贴出去都变味了。给大家带来不便不能全怪我。但是故事还没讲完，无论如何我都得讲下去。我在用英文写的那个版本里（纯粹为了看看贴出去的效果）提到使用GProductCreator至少有两个原因，其中一个就是为了用于Factory模式。另外一个原因是，一个继承体系最好不要让用户自己来构造，而是将自己托管给一个对象生成器，所以它们应当把自己所有的constructor声明为private，而将这个生成器声明为自己的friend。GProductCreator正好可以充当这个角色。当然，GProductCreator的CreatePolicy参数应当由继承体系提供。下面的代码用于对上述方法的测试：#include "stdafx.h"#include #include #include #include "Factory.h"#include "Singleton.h"using namespace std;using namespace Loki; //classes for testing.begin:class GObject{public:virtual void print() = 0;};class GTank:public GObject{public:virtual void print(){cout<<"GTank/n";}};class GBullet:public GObject{public:virtual void print(){cout<<"GBullet/n";}};class GETank:public GTank{public:virtual void print(){cout<<"GETank/n";}};//classes for testing.end.typedef unsigned long identifier_type;template struct GAbstractCreator{virtual AbstractProduct* operator()(){return 0;}};templatestruct GProductCreator: public GAbstractCreator{Product* pP;AbstructProduct* operator()(){ return CreatePolicy::Create(pP);}};//Because The Create Poily I Used Is Polymorphic, Which The Loki Factory Did Not//Suport, I Add The FactoryUsingPointer Template Class Into The Libarytypedef Loki::FactoryUsingPointer >Factory1;class Test;typedef Loki::FactoryUsingPointerFactory2; typedef Factory1 /*Or Factory2*/ TheFactory;typedef Loki::SingletonHolder theFactory;//Factory Uses Like This://if( !theFactory::Instance().Register(GEnemyTankA::get_id(), GProductCreator()) )// throw(); void f(){//Creator Test://the simplest using: typedef GProductCreator TheTankCreator;TheTankCreator theTankCreator;theTankCreator.operator ()() ->print();//let's use it a little more complex:GProductCreator()()->print();//using default template argument:GProductCreator()()->print();//ok, the complier seems not so displeasing, it works really well,//I think should not curse ms this morning.//Factory Test://now, let's try the Factory method:Factory1 factory1;factory1.Register(1, &theTankCreator);//ok. //Singleton Test://try Singleton:theFactory::Instance().Register(2, &theTankCreator); theFactory::Instance().CreateObject(2)->print();//ok.//Final Test//now, let me give the compiler a puzzle:SingletonHolder< FactoryUsingPointer< GObject, unsigned long, GAbstractCreator >//FactoryUsingPointer As The First Template Argument Of SingletonHolder.,CreateUsingMalloc,PhoenixSingleton>::Instance().Register(1, &GProductCreator()); //oh! not give the compiler a puzzle, but you and me!//ok,the Creation Policy, the Factory Policy with Polymorphic Creator and//the Singleton Pattern, they do work together very well, that's GREAT!//ESPECIALLY, the FactoryUsingPointer and the GProductCreator are EXCITING!}int main(int argc, char* argv[]){try{ f();}catch(DefaultFactoryError::Exception e){ cout<

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