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:[email protected]] 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 <[email protected]> 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" <[email protected]>
> Sent: Wednesday, February 17, 2016 19:51
> To: "Gamers Discussion list" <[email protected]>
> 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 <[email protected]> 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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