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Maxlor
Joined: 22 Nov 2004
Posts: 1
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 Posted: Mon Nov 22, 2004 8:57 pm Post subject: copy on assignment |
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I'm just starting with D, trying to figure out how it works. I've run into this thing here, and have been unable to find a solution online. Maybe you guys can explain things to me?
Lets say I have a class like this:
| Code: | class Human {
this(uint age) { mAge = age; }
int age() { return mAge; }
void age(int age) { mAge = age; }
} |
Now, if I do this, joe will be a reference to peter, as if I had used the & operator in C++, ie, peter's age will be 30 as well at the end.
| Code: | void main() {
Human peter = new Human(25);
Human joe = peter;
joe.age = 30;
printf("peter's age is ?i\n", peter.age);
return 0;
} |
Is there an easy way to have D make a copy, other than having to put the necessary copying code into the class itself? A shallow copy would do.
Hm... while I'm at it, another, smaller question. This doesn't work, obviously:
| Code: | | Human* jack = new Human(20); |
Is there a way to create an anonymous object and have its address stored in a pointer? |
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Hohums
Joined: 08 Apr 2004
Posts: 71
Location: Western Australia
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| Posted: Fri Nov 26, 2004 8:33 am Post subject: Re: copy on assignment |
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| Maxlor wrote: | I'm just starting with D, trying to figure out how it works. I've run into this thing here, and have been unable to find a solution online. Maybe you guys can explain things to me?
Is there an easy way to have D make a copy, other than having to put the necessary copying code into the class itself? A shallow copy would do.
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Use a struct instead (there are other ways but that is probably the simplest).
| Maxlor wrote: |
Hm... while I'm at it, another, smaller question. This doesn't work, obviously:
| Code: | | Human* jack = new Human(20); |
Is there a way to create an anonymous object and have its address stored in a pointer? |
In D a class object is stored as its pointer. That is:
c++
Human* jack = new Human(20);
D
Human jack = new Human(20);
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http://badmama.com.au/~anderson/ |
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