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Pointers

Started by Ataru Mar 15, 2003 at 11:06 PM 5 replies 1.1k views

Original Post

Mar 15, 2003 at 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

Mar 15, 2003 at 11:10 PM

Maybe you should just declare your insert function like this:

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

without the & .

Ataru

Mar 15, 2003 at 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

Mar 15, 2003 at 11:35 PM


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);
}

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.

Ataru

Mar 15, 2003 at 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

Mar 16, 2003 at 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.

Ataru

Mar 16, 2003 at 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

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