Hi,
I don't really like to do code handouts. It isn't conducive to good
learning. Still, I'm vaguely interested in this since I myself have
not ever sorted strings alphabetically, so I will write something up
here.
This implementation may have errors. I tested it on six items with
various first letters and it worked great, but I may have not
accounted for some edge cases, who knows.
Here is the opCmp method you should use.
int opCmp(players_items@ other)
{
// Lowercase both strings so that uppercase lettered items do not
appear before lowercased ones.
string other_name=string_to_lower_case(other.name);
string original_name=string_to_lower_case(name);
// Now simply do comparisons as we would do on ints. Keep in mind this
deceptively simple action will take much longer than integer
comparison.
if(original_name>other_name)
return 1;
else if(original_name<other_name)
return -1;
else
return 0;
}
Best,
Aaron
On 2/19/16, Paul Lemm <paul.lem...@gmail.com> wrote:
> 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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