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

class Task {
public:
    virtual void Sync() = 0;
};
class FooTask : public Task {
    void Sync() override {
        cout << "Foo:Sync" << endl;
    }
};
class BarTask : public Task {
    void Sync() override {
        cout << "Bar:Sync" << endl;
    }
};

int main()
{
    typedef std::shared_ptr<class Task> TaskSharedPtr;

    TaskSharedPtr tasks[2] = {make_shared<FooTask>(), make_shared<BarTask>()};
    tasks[0]->Sync();
    tasks[1]->Sync();

    return 0;
}