c++中dynamic_cast的用

c++中dynamic_cast的作用

#include<iostream>

#include<memory>

//Someone eles‘s code,eg.library

class IGlyph

{

virtual ~IGlyph(){}

virtual std::string Text() = 0;

virtual IIcon* Icon() = 0;

//...

};

class IWidgetSelector

{

public:

virtual ~IWidgetSelector(){}

virtual void AddItem(IGlyph*) = 0;

virtual IIcon *Selection() = 0;

};

//Your code

class MyItem:public IGlyph

{

public:

virtual std::string Text()

{

return this->text;

}

virtual IIcon* Icon()

{

return this->icon.get();

}

void Activate()

{

std::cout << "My Item Activated" << std::endl;

}

std::string text;

std::auto_ptr<IIcon> icon;

};

void SpiffyForm::OnDoubleClick(IWidgetSelector* ws)

{

IGlyph *gylph = ws->Selection();

MyItem *item = dynamic_cast<MyItem*>(gylph);

if (item)

item->Activate();

}

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