Decorator_Exercise.cpp

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#include <iostream>
 
#include "helpers/formatstring.h"
 
#include "Decorator_Exercise.h"
#include "Decorator_Classes.h"
 
 
namespace DesignPatternExamples_cpp
{
 
    // ! [Using Decorator in C++]
    void Decorator_Exercise()
    {
        std::cout << std::endl;
        std::cout << "Decorator Exercise" << std::endl;
 
        IRenderElement::shared_ptr_t baseElement;
        baseElement = std::make_shared<TextElement>("This is raw text");
 
        // Wrap the base element in three decorators.
        IRenderElement::shared_ptr_t wrappedElement =
            std::make_shared<WhiteBackgroundDecorator>(
                std::make_shared<UnderlineDecorator>(
                    std::make_shared<RedForegroundDecorator>(baseElement)));
 
        // Now render the elements to the console.
        std::cout
            << Helpers::formatstring("  base Text element: \"%s\"", baseElement->Render().c_str())
            << std::endl;
        std::cout
            << Helpers::formatstring("  Decorated element: \"%s\"", wrappedElement->Render().c_str())
            << std::endl;
 
        std::cout << "  Done." << std::endl;
    }
    // ! [Using Decorator in C++]
 
 
} // end namespace