Array access via pointer
Simen kjaeraas
simen.kjaras at gmail.com
Sun May 30 14:12:06 PDT 2010
Robert <robert.muench at robertmuench.de> wrote:
> On 2010-05-30 22:16:55 +0200, Pelle <pelle.mansson at gmail.com> said:
>
>> &data[0] and &data are very different things, if you have a dynamic
>> array.
>
> Yes, that's what I found out too. What's the exact difference?
Going again with the C code:
typedef struct array {
int* data;
int length;
};
You would use an array like this:
void foo( ) {
array arr;
arr.ptr = malloc(32);
arr.length = 8;
}
Now, as you can probbly see, &arr would give the pointer to the
struct, not to the data. Basically, a pointer to pointer to int,
rather than the pointer to int you want.
--
Simen
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