67 lines
1.4 KiB
C++
67 lines
1.4 KiB
C++
#include <iostream>
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class CWidget; // Forward-declare that we have a class named CWidget.
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class CFactory
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{
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private:
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unsigned int m_uiCount;
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public:
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CFactory();
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~CFactory();
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CWidget* GetWidget();
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};
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class CWidget
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{
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private:
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unsigned int* m_pCounter;
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private:
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CWidget(); // Disallow the default constructor.
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CWidget(const CWidget&); // Disallow the copy constructor
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CWidget& operator=(const CWidget&); // Disallow the assignment operator.
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public:
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CWidget(unsigned int* pCounter);
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~CWidget();
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};
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// CFactory constructors and destructors. Very simple things.
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CFactory::CFactory() : m_uiCount(0) {}
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CFactory::~CFactory() {}
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// CFactory method which creates CWidgets.
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CWidget* CFactory::GetWidget()
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{
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// Create a new CWidget, tell it we're its parent.
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return new CWidget(&m_uiCount);
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}
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// CWidget constructor
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CWidget::CWidget(unsigned int* pCounter) : m_pCounter(pCounter)
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{
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++*m_pCounter;
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std::cout << "Widget spawning. There are now " << *m_pCounter<< " Widgets instanciated." << std::endl;
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}
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CWidget::~CWidget()
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{
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--*m_pCounter;
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std::cout << "Widget dieing. There are now " << *m_pCounter<< " Widgets instanciated." << std::endl;
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}
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int main()
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{
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CFactory factory;
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CWidget* pWidget1 = factory.GetWidget();
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CWidget* pWidget2 = factory.GetWidget();
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delete pWidget1;
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CWidget* pWidget3 = factory.GetWidget();
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delete pWidget3;
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delete pWidget2;
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}
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