Global Classes

How do I make a class item global? This is what i'm doing now....(i'm using borland c++ builder 6.0)


extern int x;
extern int y ;
extern Tank1 *Tank = new Tank1;
extern TImage *Sprite_Tank1 = new TImage(Owner);

in a .h file

Tank1 *Tank = new Tank1;
TImage *Sprite_Tank1 = new TImage(Owner);
int x;
int y ;
int i;

y=200;
x=100 ;

in the main .cpp file under a button click

yes i've included the .h file in the main .cpp file!

As long as I don't do the extern thingy for {TImage *Sprite_Tank1 = new TImage(Owner);} , it compiles, but isnt global, but when I do the extern thingy, it says "[C++ Error] Whack.h(15): E2451 Undefined symbol 'Owner'"

Any suggestions?


Thanks

DW

Code:

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extern int x;

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Put it in code tags before I attempt to read it.

Quote:

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Originally posted by Death_Wraith
How do I make a class item global? This is what i'm doing now....(i'm using borland c++ builder 6.0)

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Do you mean a single item from a class? You don't.
Do you mean a an instance of the class? Define it outside of all functions, including main().

Quote:

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Originally posted by Death_Wraith
extern int x;
extern int y ;
extern Tank1 *Tank = new Tank1;
extern TImage *Sprite_Tank1 = new TImage(Owner);

in a .h file

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You cannot use extern and create a variable at the same time. The extern simply tells the compiler that "this variable is not defined here but watch for it -- it will be used here"

Quote:

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Originally posted by Death_Wraith
Any suggestions?

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Define the variable in a c-source file, specify only the

Code:

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extern Tank1 *Tank;

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in the header file.

Quote:

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Do you mean a an instance of the class? Define it outside of all functions, including main().

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I tired this, but the compiler complains.

"[C++ Error] Whack.h(15): E2451
Undefined symbol 'Owner'"