Iterator_Exercise.cpp

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#include <iostream>
 
#include "helpers/formatstring.h"
 
#include "Iterator_Exercise.h"
#include "Iterator_Class.h"
 
 
namespace DesignPatternExamples_cpp
{
 
    // ! [Using Iterator in C++]
    void Iterator_Exercise()
    {
        std::cout << std::endl;
        std::cout << "Iterator Exercise" << std::endl;
 
        // For this example, the class already has built into it the data
        // to be iterated over.
        IteratorContainer_Class items;
 
        std::cout << "  Iterating over keys only:" << std::endl;
        auto keyIterator = items.GetKeys();
        std::string item;
        while (keyIterator->Next(item))
        {
            std::cout << Helpers::formatstring("    %s", item.c_str()) << std::endl;
        }
 
        std::cout << "  Iterating over values only:" << std::endl;
        auto valueIterator = items.GetValues();
        std::string value;
        while (valueIterator->Next(value))
        {
            std::cout << Helpers::formatstring("    %s", value.c_str()) << std::endl;
        }
 
        std::cout << "  Iterating over all items:" << std::endl;
        auto itemIterator = items.GetItems();
        ItemPair key_value_pair;
        while (itemIterator->Next(key_value_pair))
        {
            std::cout << Helpers::formatstring("    %s = %s",
                            key_value_pair.Key.c_str(), key_value_pair.Value.c_str())
                      << std::endl;
        }
 
        std::cout << "  Done." << std::endl;
    }
    // ! [Using Iterator in C++]
 
} // end namespace