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➜ SMAUG
➜ SMAUG coding
➜ What's the difference...
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| Posted by
| Ithildin
USA (262 posts) Bio
|
| Date
| Thu 02 Dec 2004 05:15 AM (UTC) |
| Message
| What's the difference between:
skill_table[sn]->spell_level
and
skill_table[sn].spell_level | | Top |
|
| Posted by
| David Haley
USA (3,881 posts) Bio
|
| Date
| Reply #1 on Thu 02 Dec 2004 05:39 AM (UTC) |
| Message
| Well, only one of them is valid, depending on what type of thing you're storing.
First things first...
skill_table[sn]
This is equivalent to:
*(skill_table+sn)
In other words, take the address skill_table, move 'sn' elements forward, and get that value. This is what array indexing really is.
Let us call the result of this operation "s", for simplicity.
Now, for:
s.bla
and
s->bla
s.bla means that s is in fact a structure, and so we can directly access the 'bla' member.
s->bla means that s is a pointer to a structure, so we must first dereference (follow) the pointer, and then do the normal structure retrieval to get the 'bla' member.
If skill_table is an array of pointers to structs, you must use s->bla. If skill_table is an array of structs, you must use s.bla.
Array of pointers to structs:
struct foo { ... };
foo* * myArray;
Array of structs:
foo * myArray;
Note that an array is in fact just a pointer that happens to point to a contiguous block. But, for all intents and purposes, a pointer to an array is the same thing as a pointer to a single element. (This is why strings in C are arrays and also char*, remember.)
Does this answer your question? |
David Haley aka Ksilyan
Head Programmer,
Legends of the Darkstone
http://david.the-haleys.org | | Top |
|
| Posted by
| Ithildin
USA (262 posts) Bio
|
| Date
| Reply #2 on Thu 02 Dec 2004 06:38 AM (UTC) |
| Message
| Yes, that helps out heaps.
Thanks for the help. | | Top |
|
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