Visitor_Exercise.cpp

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#include <iostream>
 
#include "helpers/formatstring.h"
 
#include "Visitor_Exercise.h"
#include "Visitor_Visitor_Class.h"
#include "Visitor_Village.h"
 
 
namespace DesignPatternExamples_cpp
{
 
    // ! [Using Visitor in C++]
    void Visitor_Exercise()
    {
        std::cout << std::endl;
        std::cout << "Visitor Exercise" << std::endl;
 
        std::cout << "  Creating Village" << std::endl;
        std::unique_ptr<Visitor_Village> village = std::make_unique<Visitor_Village>();
        village->LoadVillage();
 
        OrderVisitor visitor(StringList{ "hamburger" });
        std::cout
            << Helpers::formatstring("  Ordering a hamburger from a shop in the %s",
                village->Name.c_str())
            << std::endl;
        // Visit all shops and place an order for a hamburger at the shop
        // that sells them.  We don't know which shop it is and we don't
        // need to know until we receive the order.
        village->Accept(&visitor);
        if (!visitor.ItemsReceived.empty())
        {
            // We are expecting only a single item
            std::cout
                << Helpers::formatstring("  We received a %s from %s.",
                    visitor.ItemsReceived[0].c_str(),
                    visitor.ShopNameReceivedFrom.c_str())
                << std::endl;
        }
        else
        {
            std::cout << "  Failed to receive a hamburger" << std::endl;
        }
 
        std::cout << "  Done." << std::endl;
    }
    // ! [Using Visitor in C++]
 
} // end namespace