Back to General and Gameplay Programming

Pointers

General and Gameplay Programming Programming

Started by Ataru March 15, 2003 11:06 PM

5 comments, last by Ataru 21 years, 1 month ago

Ataru

133

Author

March 15, 2003 11:06 PM

Maybe I''m just tired but I can''t seem to get this to work. Here''s some pseodocode of my problem. File 1.


game_object *items[1000];

foo()
{
  insert(items[0]);
}

File 2


struct node 
{
game_objects *inserted[5];
int numObj=0;
};

//Node is properly initialized, memory is allocated
void insert(game_object* &toInsert)
{
 tst->inserted[0] = toInsert;
 printf("%d %d",toInsert->x,toInsert->y);
}

When I try to acess toInsert (via the printf) the program crashes. For some reason tst->inserted[0] does not point to the same address as items[0] (which is what I want). Maybe I''ll figure it out in the morning, but I always get these stupid pointer things wrong. Any help is appreciated.

RabidChild

122

March 15, 2003 11:10 PM

Maybe you should just declare your insert function like this:

void insert(game_object * toInsert)
{
.
.
.
}

without the & .

--Ben CarterRomans 8:38-39

Ataru

133

Author

March 15, 2003 11:26 PM

No, that''s what I tried first. When it didn''t work I figured I had to send the pointer to the address but still no go.

Alpha_ProgDes

6,963

March 15, 2003 11:35 PM

struct node{game_objects *inserted[5];int numObj=0;};//Node is properly initialized, memory is allocatedvoid insert(game_object* &toInsert){tst->inserted[0] = toInsert;printf("%d %d",toInsert->x,toInsert->y);}

it should be (i think)

void insert(game_objects **toInsert){  tst->inserted[0] = **toInsert; // assigning values not addresses  printf("%d %d", *toInsert->x, toInsert->y);}

i don''t have my book in front of me but i think that''s 80% right,
i think.

Beginner in Game Development? Read here. And read here.

Ataru

133

Author

March 15, 2003 11:56 PM

Still a no go. You have to pass the address of course so it would be:

insert(&items[0]);

insert(game_node **obj) ...

but the same thing happens. I don''t want to pass the value. I just want an array of pointers pointing to instantiated objects. Ugh, it should work.

Alpha_ProgDes

6,963

March 16, 2003 12:13 AM

Take a look at this. it may might drop a lightbulb

also have you tried this:

&(tst)->inserted[0] = toInsert;

try it with and without the parenthesis.

hope you figure this out soon.

Beginner in Game Development? Read here. And read here.

Ataru

133

Author

March 16, 2003 12:41 AM

Or I could have really been tired (I wasn''t kidding) and not realized that I was actually passing the equiv of items[0+1] and therefore passing a NULL pointer to insert.

Lol, thanks for the help everyone

Pointers

This topic is closed to new replies.

Popular Topics

Recommended Tutorials

Pointers

This topic is closed to new replies.

Popular Topics

Recommended Tutorials

Reticulating splines