【Poco】Poco::DynamicFactory的例子

#include "../tmain.hpp"namespace DF{class Base{public:Base(){}virtual ~Base(){}};class A: public Base{public:void print(){std::cout << "My name is A Class!" << std::endl;}};class B: public Base{};}void test_DynamicFactory(){// 建立一個工廠執行個體.Poco::DynamicFactory<DF::Base> dynFactory;// 類A註冊到工廠, 註冊名為A, 當然也可以為其他的名字.dynFactory.registerClass<DF::A>("A");dynFactory.registerClass<DF::B>("B");assert (dynFactory.isClass("A"));assert (dynFactory.isClass("B"));// 通過工廠, 建立類A的對象.DF::A* a = dynamic_cast<DF::A*>(dynFactory.createInstance("A"));std::auto_ptr<DF::A> ap(dynamic_cast<DF::A*>(dynFactory.createInstance("A")));a->print();ap->print();try{// 已經註冊過了, 將拋出異常.dynFactory.registerClass<DF::A>("A");}catch (...){}try{// 反註冊類B的dynFactory.unregisterClass("B");// 未註冊的類, 註冊時將拋出異常.std::auto_ptr<B> b(dynamic_cast<B*>(dynFactory.createInstance("B")));}catch (Poco::NotFoundException&){}}