On Tue, 10 Apr 2012 09:41:28 +0200, CrudOMatic <crudoma...@gmail.com>
wrote:
The D documentation is a little lacking in a lot of areas. I'm needing
to know an exact way of making arrays of objects.
For example:
/* Deck class */
// Will be adjusted with the proper cards for each game type
class Deck {
/* Card count - used to keep track of how many cards are left in the
deck - when zero, Deck is discarded from the Shoe */
int cardCount;
/* Cards array - initialized to cardCount elements */
Card cards[];
/* Constructor */
this(int no_cards) {
cardCount = no_cards;
cards = new Card[cardCount];
}
/* Destructor */
~this() {
delete cards;
}
}
the cards[] array is meant to be an array of Card objects, and I'm
initializing it in the constructor as seen above. This hasn't been
tested yet, but I'm needing to know if this is the correct way of doing
it - to save headaches later.
Also, while I'm here, how would you go about moving objects from the
cards array in the Deck class to another class containing a cards array
- I'm talking about MOVING them, not COPYING them. I don't want any
issues with references being destroyed after being moved to another
class when I happen to destroy an instance of the Deck class.
In D, arrays includes the number of elements in the array.
Card[] cards;
assert(cards.length == 0); // Automatically initialized to 0 elements
cards.length = cardCount; // cards gets cardCount of null elements
cards.reserve(cardCount); // This just extends the array without filling
with null elements. cards.length stays at 0
D includes array slices - a view into an array. This way, you can
reference cards without copying them.
auto other = cards[1..$-1]; // all but first and last card
I'll let someone else answer the moving part as I'm not sure how that
could be done.
The delete statement is going away. You should use clear(cards) instead.
This really isn't needed as Ds GC will take care of it eventually.
Your example could be written as
class Deck {
Card[] cards;
@property int cardCount() {
return cards.length;
}
this(int no_cards) {
cards.reserve(no_cards);
}
}
Arrays are more complicated than they seem at first. I recommend you read
this article: http://dlang.org/d-array-article.html
D has a newsgroup, .learn, for beginner questions.
