Hi,
not so much into software design patterns [further - SDP], so while learning this "thing" i have some issues with trying to combine multiple SDP. I think that there are some logical issues..
Thank you for your time! :)
#include <iostream>
using namespace std;
/*the Command interface*/
class Command
{
public:
virtual void execute()=0;
};
/*Receiver class*/
class Light {
public:
Light() { }
void turnOn()
{
cout << "The light is on" << endl;
}
void turnOff()
{
cout << "The light is off" << endl;
}
};
/*the Command for turning on the light*/
class FlipUpCommand: public Command
{
public:
FlipUpCommand(Light& light):theLight(light)
{
}
virtual void execute()
{
theLight.turnOn();
}
private:
Light& theLight;
};
/*the Command for turning off the light*/
class FlipDownCommand: public Command
{
public:
FlipDownCommand(Light& light) :theLight(light)
{
}
virtual void execute()
{
theLight.turnOff();
}
private:
Light& theLight;
};
class Switch {
public:
Switch(Command& flipUpCmd, Command& flipDownCmd)
:flipUpCommand(flipUpCmd),flipDownCommand(flipDownCmd)
{
}
void flipUp()
{
flipUpCommand.execute ( ) ;
}
void flipDown()
{
flipDownCommand.execute ( ) ;
}
private:
Command& flipUpCommand;
Command& flipDownCommand;
};
class Decorator: public Switch // 4. "is a" relationship
{
public:
Decorator ( Switch * sw ) : swit ( *sw )
{
swit = sw;
}
/*virtual*/
void flipUp ( )
{
swit -> flipUp ( ) ; // 5. Delegation
}
void flipDown ( )
{
swit -> flipDown ( ) ; // 5. Delegation
}
private:
Switch * swit ; // 4. "has a" relationship
};
class TextColorDecorator: public Decorator
{
public:
// 6. Optional embellishment
TextColorDecorator ( Switch * sw ) : Decorator ( sw )
{
}
/*virtual*/
void flipUp ( )
{
// 7. Delegate to base class and add extra stuff
Decorator::flipUp ( ) ;
cout << " TextColorDecorator" << '\n';
}
void flipDown ( )
{
// 7. Delegate to base class and add extra stuff
Decorator::flipDown ( ) ;
cout << " TextColorDecorator" << '\n';
}
};
class TextSizeDecorator: public Decorator
{
public:
// 6. Optional embellishment
TextSizeDecorator ( Switch * sw ) : Decorator ( sw )
{
}
/*virtual*/
void flipUp ( )
{
// 7. Delegate to base class and add extra stuff
Decorator::flipUp ( ) ;
cout << " TextSizeDecorator" << '\n';
}
void flipDown ( )
{
// 7. Delegate to base class and add extra stuff
Decorator::flipDown ( ) ;
cout << " TextSizeDecorator" << '\n';
}
};
/*The test class or client*/
int main()
{
Light lamp;
FlipUpCommand switchUp(lamp);
FlipDownCommand switchDown(lamp);
Switch s(switchUp, switchDown);
Decorator dec( new TextColorDecorator ( new TextSizeDecorator ( &s ) ) );
dec.flipUp();
dec.flipDown();
}g++ error list:
testpattern.cpp: In constructor ‘Decorator::Decorator(Switch*)’:
testpattern.cpp:90:44: error: no matching function for call to ‘Switch::Switch()’
testpattern.cpp:90:44: note: candidates are:
testpattern.cpp:66:9: note: Switch::Switch(Command&, Command&)
testpattern.cpp:66:9: note: candidate expects 2 arguments, 0 provided
testpattern.cpp:64:7: note: Switch::Switch(const Switch&)
testpattern.cpp:64:7: note: candidate expects 1 argument, 0 provided
testpattern.cpp:90:44: error: cannot convert ‘Switch’ to ‘Switch*’ in initialization