Loki::CyclicVisitor

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Loki::CyclicVisitor类似设计模式中访问者模式

#include <loki/Visitor.h>       // 使用了Loki中的cyclic visitor模板#include <loki/TypelistMacros.h>#include <loki/Functor.h>#include <loki/AssocVector.h>#include <iostream>using namespace std;class Dog;class Cat;class Wolf;typedef   Loki::CyclicVisitor<void, LOKI_TYPELIST_3(Dog, Cat, Wolf)>    MyVisitor;class Animal{public:    virtual    void    Accept(MyVisitor& v) = 0;public:    virtual    void    say(){ cout << "I am Animal class" << endl; }};class Dog :public Animal{public:    LOKI_DEFINE_CYCLIC_VISITABLE(MyVisitor)public:    void    say(){ cout << "I am Dog" << endl; }};class Cat :public Animal{public:    LOKI_DEFINE_CYCLIC_VISITABLE(MyVisitor)public:    void    say(){ cout << "I am Cat" << endl; }};class Wolf :public Animal{public:    LOKI_DEFINE_CYCLIC_VISITABLE(MyVisitor)public:    void    say(){cout<<"I am Wolf"<<endl;}};class ConcretVisitor :public MyVisitor{public:    void Visit(Dog& dog)    {        dog.say();    }    void Visit(Cat& cat)    {        cat.say();    }    void Visit(Wolf& wolf)    {        wolf.say();    }};void testFunc(std::shared_ptr<Animal> pAnimal){    ConcretVisitor cv;    pAnimal->Accept(cv);}int main(){    std::shared_ptr<Animal> pDog = std::make_shared<Dog>();    std::shared_ptr<Animal> pCat = std::make_shared<Cat>();    std::shared_ptr<Animal> pWolf = std::make_shared<Wolf>();    testFunc(pDog);    testFunc(pCat);    testFunc(pWolf);    getchar();    return 0;}

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