Call by Reference not working, am i doing it wrong

[Digital Don]

Hi,

I am working on my OpenGL C++ assignment to create the STARCASTLE game. Most of my code uses call to function in different classes (files) without any parameters but when I need to send parameters to other classes I cannot send the reference instead a new instance is created in teh other end.

I am doing it the following way tell me if it is right...

in StarCastle.cpp in timerFunction

 ship.HandleShipPlasmaCollision(cannon)

ship and cannon are Global Class variables of Class type SpaceShip and Cannon in StarCastle.cpp

I want to send cannon and change a variable depending on the situation in the HandleShipPlasmaCollision() function which is in SpaceShip.cpp

The function in SpaceShip.cpp is as follows:

 
void SpaceShip:: HandleShipPlasmaCollision(Cannon &cannon)
{ 
cannon.setFiringMode(true); /*---This effects hee but when it returns to the calling funtcion I donot get the changed value there..---*/
}
 

How should I send the parameter so that when I change the value in the SpaceShip.cpp for the Cannon Class variable the effect is seen also in teh StarCastle.cpp?

My assignment is due tomorrow morning at 9 AM and I am stuck with this small silly problem...

Please reply soon

Thank You in advance....

[Studlyami]

when you call the function pass a pointer to the variable

FunctionCall( *Variable);
then on the function definition
void FunctionCall(int &Variable);

[mohammadazim]

Hi,

I am working on my OpenGL C++ assignment to create the STARCASTLE game. Most of my code uses call to function in different classes (files) without any parameters but when I need to send parameters to other classes I cannot send the reference instead a new instance is created in teh other end.

I am doing it the following way tell me if it is right...

in StarCastle.cpp in timerFunction

 ship.HandleShipPlasmaCollision(cannon)

ship and cannon are Global Class variables of Class type SpaceShip and Cannon in StarCastle.cpp

I want to send cannon and change a variable depending on the situation in the HandleShipPlasmaCollision() function which is in SpaceShip.cpp

The function in SpaceShip.cpp is as follows:

 
void SpaceShip:: HandleShipPlasmaCollision(Cannon &cannon)
{ 
cannon.setFiringMode(true); /*---This effects hee but when it returns to the calling funtcion I donot get the changed value there..---*/
}
 

How should I send the parameter so that when I change the value in the SpaceShip.cpp for the Cannon Class variable the effect is seen also in teh StarCastle.cpp?

My assignment is due tomorrow morning at 9 AM and I am stuck with this small silly problem...

Please reply soon

Thank You in advance....

If Cannon and ship are global variables, where and how have you instantiated the object. I feel there is some bug somewhere your are instantiating object cannon. Ideally what you have done should work fine. And evidence is that your code is compiling fine.