навигатор

Strategy.cpp

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

class RouteStrategy {
public:
    virtual void buildRoute(const string& from, const string& to) = 0;
    virtual ~RouteStrategy() {}
};

class CarRoute : public RouteStrategy {
public:
    void buildRoute(const string& from, const string& to) override 
    {
        cout << "Building route for car from : " << from << " to " << to << endl;
    }
};

class WalkingRoute : public RouteStrategy {
public:
    void buildRoute(const string& from, const string& to) override 
    {
        cout << "Building walking route from : "<< from << " to " << to << endl;
    }
};

class PublicTransportRoute : public RouteStrategy {
public:
    void buildRoute(const string& from, const string& to) override 
    {
        cout << "Building public transport route from : " << from << " to " << to << endl;
    }
};

class Navigator {
private:
    RouteStrategy* strategy;

public:
    Navigator(RouteStrategy* strategy)
    {
        this->strategy = strategy;
    }

    void setStrategy(RouteStrategy* newStrategy) 
    {
        strategy = newStrategy;
    }

    void buildRoute(const string& from, const string& to) 
    {
        if (strategy)
            strategy->buildRoute(from, to);
        else
            cout << "Strategy is not set!" << endl;
    }
};

int main() {
    Navigator navigator(new CarRoute());
    navigator.buildRoute("point A", "point B");

    navigator.setStrategy(new WalkingRoute());
    navigator.buildRoute("Home", "Shop");

    navigator.setStrategy(new PublicTransportRoute());
    navigator.buildRoute("Hospital", "Center");

    return 0;
}