Templatized Visitor Pattern Example, C++ (vc++)

Templatized Visitor Pattern Example

//Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23506 for x86

#include <iostream>
#include <string>
using namespace std;

template<typename>
class IClassVisitor;
    
class TestVisitor;

template<typename T>
class Visitable
{
public:
	void Accept(IClassVisitor<T>* visitor);
};

class Test : public Visitable<Test>
{
public:
	Test() : val(111) {}
	void work() {}
    int getVal() { return val; }
private:
	int val;
};

template<typename T>
class IClassVisitor
{
public:
	virtual void Visit(T& obj) = 0;
};

template<typename T>
void Visitable<T>::Accept(IClassVisitor<T>* visitor)
{
	visitor->Visit(static_cast<T&>(*this));
}

class TestVisitor : public IClassVisitor<Test>
{
	void Visit(Test& obj) override
	{
		cout << "Visiting Test class with new Visitor. Member Value : " << obj.getVal() << endl;
	}
};

int main()
{
	cout << "Visitor Pattern Example" << endl;

Test * ptr = new Test();
	IClassVisitor<Test>* visitor = new TestVisitor();
	ptr->Accept(visitor);

cout << "Done" << endl;
}


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