Hi Aaron,
Thanks for the reply that makes sense. Sorry to be a pain I'm still not 100%
sure though how I'd add that into my code so that I could get opCmp to
sort the array of class's alphabetically by name. could I ask for an
example using the below script how you'd add that in there to sort the
array?
class players_items
{
string name;
players_items(string name)
{
this.name = name;
}
}
players_items@[] inventory;
many thanks
-----Original Message-----
From: Gamers [mailto:gamers-boun...@audyssey.org] On Behalf Of Aaron Baker
Sent: Friday, February 19, 2016 12:52 AM
To: Gamers Discussion list
Subject: Re: [Audyssey] bgt operator overloading question
opCmp wants you to return a positive number if the source object is
greater than the parameter passed, 0 if they are equal, and -1 if the
source object is less than the parameter.
You can use the less than and greater than operator on strings, so the
rest should be obvious. One not so obvious complication is that this
sort technique is case sensative, so make sure to unify the case by
either uppercasing or lowercasing all characters.
Best,
Aaron
On 2/18/16, Paul Lemm <paul.lem...@gmail.com> wrote:
> Hi Aaron and John,
>
> This is something that has had me stuck for a while now. As in a game I
> have written, I have created a class, and then created an aray of that
> class, but want to sort the array so it is alphabetical. I've read the
> help topic on sorting arrays which makes sense for sorting an array of
> strings , but I don't understand how I would get it to sort an array of
> classes. The BGT help document just says you need to overload the
> comparison
> operator. I've always been a little unclear on overloading operators and
> not sure how I would go about overloading the comparison operator in my
> class. So using the basic class code below how would I go about
overloading
> the comparison operator and then sorting the array of that class
> alphabetically by name?
>
> class players_items
> {
> string name;
> string description;
> bool key_item;
> players_items(string name, string description, bool key_item)
> {
> this.name = name;
> this.description = description;
> this.key_item = key_item;
> }
> }
>
>
> Players_items[] inventory;
>
> Many thanks for any help you can offer
>
> Paul
>
>
>
>
>
>
> -----Original Message-----
> From: Gamers [mailto:gamers-boun...@audyssey.org] On Behalf Of Aaron Baker
> Sent: Thursday, February 18, 2016 1:20 PM
> To: Gamers Discussion list
> Subject: Re: [Audyssey] bgt operator overloading question
>
> Hello,
> Did you actually try it? I know that that can make the difference
> between runtime error and no runtime error. I thought it was kind of
> odd too, but it is usually bad practice to pass an object by value
> anyway. If you're worried about the object changing, you might be able
> to write it as "const stat@ other".
> I really think that is the problem.
> This code gives me a runtime error:
> "
> class stat
> {
> int percent;
> int opCmp(stat other)
> {
> return percent-other.percent;
> }
> }
> stat[] stats;
> void main()
> {
> stats.sort_descending();
> }
> "
>
> And this code doesn't:
> "
> class stat
> {
> int percent;
> int opCmp(stat@ other)
> {
> return percent-other.percent;
> }
> }
> stat[] stats;
> void main()
> {
> stats.sort_descending();
> }
> "
> Best,
> Aaron
>
> On 2/18/16, john <jpcarnemo...@gmail.com> wrote:
>> Seems to be a nogo.
>> I'd be surprised if that was the issue; handles are close enough to
> objects
>>
>> for it to not matter as function parameters in my experience.
>>
>> --------------------------------------------------
>> From: "Aaron Baker" <theultimatemasterofarc...@gmail.com>
>> Sent: Wednesday, February 17, 2016 19:51
>> To: "Gamers Discussion list" <gamers@audyssey.org>
>> Subject: Re: [Audyssey] bgt operator overloading question
>>
>> Hey John,
>> Try switching your parameter from "stat other" to "stat@ other".
>> I think opCmp wants a handle (by reference), not a by value object.
>> Best,
>> Aaron
>>
>> On 2/17/16, john <jpcarnemo...@gmail.com> wrote:
>>> Hi all,
>>> I'm attempting to overload comparison operators in order to sort an
>>> array
>>>
>>> of
>>> objects, with the following function:
>>> //begin code
>>> int opCmp (stat other)
>>> {
>>> return percent-other.percent;
>>> }
>>> //end code
>>> However, the program gives me the following error as soon as comparison
>>> takes place:
>>> A runtime error occurred. File:function: void main()Description: Type
>>> 'stat'
>>> does not have a matching opCmp method
>>>
>>>
>>>
>>> Can anybody shed some light on this one?
>>>
>>>
>>>
>>> Thanks,
>>>
>>> John
>>>
>>>
>>>
>>> P.S:
>>>
>>> Yes, the comparison function is within the stat class, and comparison is
>>> being done by array.sort_descending.
>>>
>>> I have tried several case changes to the function name, and have stuck
>>> with
>>> the above because it matches both the manual and compiler error.
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