Sortlist command

Shatterhand · 03 June 2018, 06:56

Simple question... what's the syntax of the Sortlist command on BLitz 2?

I just cant use it.

I have a list called "objects"

I've tried

SortList objects
SortList objects()
SortList (objects)
SortList (objects())

all of them give me syntax errors

How do I use this command?

Thank you!

MickGyver · 03 June 2018, 07:21

The manual says:

SortList Arrayname()
... The order in which the items are sorted depends on the first field of the linked list type which must be a single integer word...

Shatterhand · 03 June 2018, 07:22

Thank you, but I do have the manual open all time, I had already seen what the manual says. It still doesn't help me at all. (The manual is very vague on many points unfortunately)

MickGyver · 03 June 2018, 10:17

Yep, I agree that the manual can be a bit vague. Does this help at all, it has some sizeof argument?

http://amiga.sourceforge.net/amigade...&action=Search

Daedalus · 03 June 2018, 23:23

Yeah, you need to tell it the size of the elements in the array you're sorting. This makes it a much faster command because it can then make assumptions on how many bytes to move instead of having to calculate it. The sizeof argument is the number of bytes a single element of the list takes up. You can either provide the absolute number, like this:

Code:

SortList objects(), 4

if objects() is an array of 4-byte elements, such as Longs or Quicks, or a Newtype consisting of a Word and two Bytes. It might be safer however to use the SizeOf keyword to get the compiler to put in the size for you - that way, if you modify the Newtype, the new size is automatically adjusted:

Code:

SortList objects(), SizeOf .l

or

Code:

SortList objects(), SizeOf .myNewType

Shatterhand · 04 June 2018, 02:59

GODDAMN IT the Manual says absolutely NOTHING about this! Thank you guys for the help!

E-Penguin · 04 June 2018, 15:06

If you wanted to reverse-sort the list you'd need to store the complement of the sort criteria, I guess? A bit of a pain.

Daedalus · 04 June 2018, 15:21

Depending on what you're sorting, the RISortLib might be of use to you. It can perform alphabetical sorting of a linked list array in either order. Numerical sorting in reverse order doesn't appear to be that easy, however I think it's not that bad if the list is being traversed - just work upwards instead of downwards.

03 June 2018, 06:56	#1
Shatterhand Warhasneverbeensomuchfun Join Date: Jun 2001 Location: Rio de Janeiro / Brazil Age: 41 Posts: 3,450	Sortlist command Simple question... what's the syntax of the Sortlist command on BLitz 2? I just cant use it. I have a list called "objects" I've tried SortList objects SortList objects() SortList (objects) SortList (objects()) all of them give me syntax errors How do I use this command? Thank you!

03 June 2018, 23:23	#5
Daedalus Registered User Join Date: Jun 2009 Location: Dublin, then Glasgow Posts: 6,334	Yeah, you need to tell it the size of the elements in the array you're sorting. This makes it a much faster command because it can then make assumptions on how many bytes to move instead of having to calculate it. The sizeof argument is the number of bytes a single element of the list takes up. You can either provide the absolute number, like this: Code: SortList objects(), 4 if objects() is an array of 4-byte elements, such as Longs or Quicks, or a Newtype consisting of a Word and two Bytes. It might be safer however to use the SizeOf keyword to get the compiler to put in the size for you - that way, if you modify the Newtype, the new size is automatically adjusted: Code: SortList objects(), SizeOf .l or Code: SortList objects(), SizeOf .myNewType

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03 June 2018, 07:21	#2
MickGyver Registered User Join Date: Oct 2008 Location: Finland Posts: 643	The manual says: SortList Arrayname() ... The order in which the items are sorted depends on the first field of the linked list type which must be a single integer word...

03 June 2018, 07:22	#3
Shatterhand Warhasneverbeensomuchfun Join Date: Jun 2001 Location: Rio de Janeiro / Brazil Age: 41 Posts: 3,450	Thank you, but I do have the manual open all time, I had already seen what the manual says. It still doesn't help me at all. (The manual is very vague on many points unfortunately)

03 June 2018, 10:17	#4
MickGyver Registered User Join Date: Oct 2008 Location: Finland Posts: 643	Yep, I agree that the manual can be a bit vague. Does this help at all, it has some sizeof argument? http://amiga.sourceforge.net/amigade...&action=Search

04 June 2018, 02:59	#6
Shatterhand Warhasneverbeensomuchfun Join Date: Jun 2001 Location: Rio de Janeiro / Brazil Age: 41 Posts: 3,450	GODDAMN IT the Manual says absolutely NOTHING about this! Thank you guys for the help!

04 June 2018, 15:06	#7
E-Penguin Banana Join Date: Jul 2016 Location: Darmstadt Posts: 1,213	If you wanted to reverse-sort the list you'd need to store the complement of the sort criteria, I guess? A bit of a pain.

04 June 2018, 15:21	#8
Daedalus Registered User Join Date: Jun 2009 Location: Dublin, then Glasgow Posts: 6,334	Depending on what you're sorting, the RISortLib might be of use to you. It can perform alphabetical sorting of a linked list array in either order. Numerical sorting in reverse order doesn't appear to be that easy, however I think it's not that bad if the list is being traversed - just work upwards instead of downwards.

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