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[Snippet] Simple Unit Indexer

moyack · 31472

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[Snippet] Simple Unit Indexer
on: December 11, 2012, 01:01:49 AM
Category: Units, Variables
Language: vJASS
Description

This library aims to provide a simple way to attach data to units via unit indexing. It offers the minimal functions required to work. This library is the result of thinking about this proposal.

Requirements:

 - Alloc 2

Actual Code
Code: jass
  1. /******************************************************************
  2. *                    SIMPLE UNIT INDEXER V1.3                     *
  3. *                           By moyack                             *
  4. *                              2012                               *
  5. *              ===================================                *
  6. *              Exclusive resource from wc3jass.com                *
  7. *              ===================================                *
  8. ******************************************************************/
  9. library UnitIndexer initializer init requires Alloc
  10. /*
  11.   PURPOSE: Index units for easy attacking data to them
  12.  
  13.   FUNCTIONS:
  14.    - GetUnitIndex: Takes a unit and returns its index (integer)
  15.    - GetIndexUnit: Takes an integer and returns the unit indexed
  16.      with that integer.
  17.  
  18.    The following functions are meant to be used when a unit is about
  19.    to be deindexed and removed from the game, via RemoveUnit() or when
  20.    it dies.
  21.    
  22.    - AddUnitEndEventCondition: Adds a contitional boolexpr variable
  23.    - AddUnitEndEventAction:    Adds an action code
  24.    - GetDeindexedIndex:        Returns the index of the removed unit
  25.    - GetDeindexedUnit:         Returns the unit about to remove
  26.  
  27.   ADVANTAGES:
  28.    - Very easy to use
  29.    - Inline friendly
  30.    - It uses arrays instead of Hashtables
  31.    - You can set the max amount of units in your map.
  32.  
  33.   DISADVANTAGE:
  34.    - Uses Unit's user data, so if in your map you use this feature in
  35.      your units, this system will put issues.
  36.      
  37.   CONFIGURATION: "SIZE" Constant.
  38.   Here you can define the maximum amount of units that your game will manage.
  39.   If you REAAALLLY need that, please set the SIZE variable with the required
  40.   amount, else DO NOT MODIFY ANYTHING.
  41.  
  42.   CREDITS:
  43.    - Magtheridon96 & Troll-Brain for his nice support and help me notice some
  44.      flaws in the code.
  45. */
  46. globals
  47.     private constant integer SIZE = 8190 // Here you set the array size, just if you need it, ok??
  48.     private          integer I    = 0    // Stores the deallocated unit index...
  49.     private          unit    U    = null // Stores the deallocated unit...
  50.     private          trigger T    = null // a trigger which will be fired when a unit is deallocated.
  51. endglobals
  52.  
  53. private struct data extends array [SIZE]
  54.     unit u
  55.    
  56.     implement Alloc
  57.    
  58.     method destroy takes nothing returns nothing
  59.         set I = this
  60.         set U = .u
  61.         if T != null then
  62.             if TriggerEvaluate(T) then
  63.                 call TriggerExecute(T)
  64.             endif
  65.         endif
  66.         call SetUnitUserData(.u, 0)
  67.         set .u = null
  68.         call .deallocate()
  69.     endmethod
  70.    
  71.     static method create takes unit u returns thistype
  72.         local thistype this
  73.         if GetUnitUserData(u) < 1 then
  74.             set this = thistype.allocate()
  75.             call SetUnitUserData(u, integer(this))
  76.         else
  77.             set this = thistype(GetUnitUserData(u))
  78.         endif
  79.         set this.u = u
  80.         return this
  81.     endmethod
  82. endstruct
  83.  
  84. // public functions
  85. function GetUnitIndex takes unit u returns integer
  86.     return GetUnitUserData(u)
  87. endfunction
  88.  
  89. function GetIndexUnit takes integer index returns unit
  90.     return data(index).u
  91. endfunction
  92.  
  93. function GetDeindexedIndex takes nothing returns integer
  94.     return I
  95. endfunction
  96.  
  97. function GetDeindexedUnit takes nothing returns unit
  98.     return U
  99. endfunction
  100.  
  101. function AddUnitEndEventCondition takes boolexpr b returns triggercondition
  102.     if T == null then
  103.         set T = CreateTrigger()
  104.     endif
  105.     return TriggerAddCondition(T, b)
  106. endfunction
  107.  
  108. function AddUnitEndEventAction takes code c returns triggeraction
  109.     if T == null then
  110.         set T = CreateTrigger()
  111.     endif
  112.     return TriggerAddAction(T, c)
  113. endfunction
  114. // end public functions
  115.  
  116. private function ClearUnit takes unit u returns nothing
  117.     call data(GetUnitIndex(u)).destroy()
  118. endfunction
  119.  
  120. hook RemoveUnit ClearUnit
  121.  
  122. private function indexit takes nothing returns boolean
  123.     return data.create(GetTriggerUnit()) < 0 // just to make it boolean :)
  124. endfunction
  125.  
  126. private function indexit2 takes nothing returns boolean
  127.     return data.create(GetFilterUnit()) < 0 // just to make it boolean :)
  128. endfunction
  129.  
  130. private function dead takes nothing returns boolean
  131.     if not IsUnitType(GetTriggerUnit(), UNIT_TYPE_HERO) then
  132.         call ClearUnit(GetTriggerUnit())
  133.     endif
  134.     return false
  135. endfunction
  136.  
  137. private function init takes nothing returns nothing
  138.     local trigger t = CreateTrigger()
  139.     local rect r = GetWorldBounds()
  141.     call TriggerRegisterAnyUnitEventBJ(t, EVENT_PLAYER_UNIT_SUMMON)
  142.     call TriggerAddCondition(t, Condition(function indexit))
  143.     call GroupEnumUnitsInRect(bj_lastCreatedGroup, r, Condition(function indexit2))
  144.     set t = CreateTrigger()
  145.     call TriggerRegisterAnyUnitEventBJ(t, EVENT_PLAYER_UNIT_DEATH)
  146.     call TriggerAddCondition(t, Condition(function dead))
  147.     set t = null
  148.     set r = null
  149. endfunction
  150.  
  151. endlibrary

Changelog:
  • 1.0: Initial release.
  • 1.1: Added detection of units removed via RemoveUnit()
  • 1.2: Added detection of resurrected units.
  • 1.3: Added functionality to trigger a condition or a function when a unit is about to be removed from the game, via RemoveUnit() or when it dies. This can be useful when you need to do something with the unit about to be removed like clearing any data attachment done to it. I don't plan to add more features, only optimization unless a good reason makes merits to an addition.

Feel free to comment.
« Last Edit: December 18, 2017, 06:25:47 AM by moyack »


Re: [snippet] Simple Unit Indexer
Reply #1 on: December 12, 2012, 02:24:20 AM
obviously indexing is bugged and deindexing just plain doesn't work

you're better off just having IndexUnit and DeindexUnit functions


Re: [snippet] Simple Unit Indexer
Reply #2 on: December 12, 2012, 07:32:02 AM
Quote from: nestharus on December 12, 2012, 02:24:20 AM
obviously indexing is bugged and deindexing just plain doesn't work
I've checked and rechecked the code and I don't see where it bugs or fails. Is a scenario issue??

Quote
you're better off just having IndexUnit and DeindexUnit functions
Well, the idea is that user don't worry about removing index, it should only worried to get the index or unit and use it.


Re: [snippet] Simple Unit Indexer
Reply #3 on: December 12, 2012, 09:46:50 AM
What about calling RemoveUnit? :o
Your system would ignore units removed using RemoveUnit :/


Re: [Snippet] Simple Unit Indexer
Reply #4 on: December 12, 2012, 09:49:24 AM
Quote from: Magtheridon96 on December 12, 2012, 09:46:50 AM
What about calling RemoveUnit? :o
Your system would ignore units removed using RemoveUnit :/
Could this be solved with a hook, isn't it??


Re: [Snippet] Simple Unit Indexer
Reply #5 on: December 14, 2012, 12:29:21 PM
http://www.hiveworkshop.com/forums/2254876-post17.html

Also hook are quite useless in the current state :

- you can't use the function arguments of the hooked function, nor the returned value ...
- if you want to use the hooked function inside the hook (and it's the case there) you have to do some silly stuff to avoid infinite recursivity.

The only way where hooks are "useful" is for debug stuff.
« Last Edit: December 14, 2012, 12:56:46 PM by Troll-Brain »

vJass is already a jass preprocessor, no need to (ab)use vJass features in order to make some inferior vJass preprocessor coded "by hand".

[Snippet] Simple Unit Indexer
Reply #6 on: January 02, 2013, 10:37:42 PM
Quote from: Troll-Brain on December 14, 2012, 12:29:21 PM
http://www.hiveworkshop.com/forums/2254876-post17.html

Also hook are quite useless in the current state :

- you can't use the function arguments of the hooked function, nor the returned value ...
- if you want to use the hooked function inside the hook (and it's the case there) you have to do some silly stuff to avoid infinite recursivity.

The only way where hooks are "useful" is for debug stuff.
Well, I was able to use hooks in the new version and it works like a charm. Please check first post and the test map.


[Snippet] Simple Unit Indexer
Reply #7 on: January 05, 2013, 07:23:53 AM
Frankly i don't really remember how hooks are "compiled", so i could be wrong before.
Anyway, that doesn't change my point of view about this resource (stated on hiveworkshop)

Also what about units which are resurrected with an active spell such as the Paladin's one ?
« Last Edit: January 05, 2013, 10:00:29 AM by Troll-Brain »

vJass is already a jass preprocessor, no need to (ab)use vJass features in order to make some inferior vJass preprocessor coded "by hand".

[Snippet] Simple Unit Indexer
Reply #8 on: January 07, 2013, 11:40:03 AM
Quote from: Troll-Brain on January 05, 2013, 07:23:53 AM
Frankly i don't really remember how hooks are "compiled", so i could be wrong before.
Anyway, that doesn't change my point of view about this resource (stated on hiveworkshop)

Also what about units which are resurrected with an active spell such as the Paladin's one ?
Checked and updated. Thanks for your revision ;)


[Snippet] Simple Unit Indexer
Reply #9 on: January 07, 2013, 03:28:41 PM
Interesting, so such units trigger the summont event and it's equal to GetTriggerUnit ?
Also you should null the "u" member on deallocate.

DId i've already said that i think this library is pointless ? :p

EDIT : And meh you're doing it wrong, i would expect that an unit keep the same data until it is removed of the game, even if it dies, and then revives.
Actually it's not always the case. And the best way is to use the 'Adef' bug, so end of this resource ?
« Last Edit: January 07, 2013, 03:57:22 PM by Troll-Brain »

vJass is already a jass preprocessor, no need to (ab)use vJass features in order to make some inferior vJass preprocessor coded "by hand".

[Snippet] Simple Unit Indexer
Reply #10 on: January 07, 2013, 05:41:56 PM
Quote from: Troll-Brain on January 07, 2013, 03:28:41 PM
Interesting, so such units trigger the summont event and it's equal to GetTriggerUnit ?
Also you should null the "u" member on deallocate.
Ok, added to 1.3...

Quote
DId i've already said that i think this library is pointless ? :p
In some way yes, but there's still some people who still loves to use this as attachment system... so I want to offer a simple version of this kind of tool.

Quote
EDIT : And meh you're doing it wrong, i would expect that an unit keep the same data until it is removed of the game, even if it dies, and then revives.
Actually it's not always the case. And the best way is to use the 'Adef' bug, so end of this resource ?
Well, I thought this but at the end we have this idea: if a unit dies, the script removes the use of attach something and anything attached to it should be removed. If you (for ANY chance) can revive it, then the script will reassign an index to use it.

Actually I'm going to make available this feature and I don't expect to add more features.


[Snippet] Simple Unit Indexer
Reply #11 on: January 07, 2013, 07:02:19 PM
I'm not sure i understand what you meant, so i will wait for your update, but for now it sounds wrong on my ears.

vJass is already a jass preprocessor, no need to (ab)use vJass features in order to make some inferior vJass preprocessor coded "by hand".

[Snippet] Simple Unit Indexer
Reply #12 on: January 07, 2013, 07:30:57 PM
Updated :)

Quote from: Troll-Brain on January 07, 2013, 07:02:19 PM
I'm not sure i understand what you meant, so i will wait for your update, but for now it sounds wrong on my ears.
What don't you understand???


[Snippet] Simple Unit Indexer
Reply #13 on: January 10, 2013, 03:37:48 PM
I simply didn't understand what was your plan for the update.
Now as i expected it fails, because when an unit dead it lost its index and that's 100 % wrong, not only because it can be resurrected but because then you can't use corpses ...
Something like the demo spell i've made with my UnitLL resource will not work with your indexer behavior.

There is only 2 way for unit indexing : recycle periodically the ids (of removed units), or deindex it on remove "event", and this last one is much better because it gives you more possibilities and controls.

vJass is already a jass preprocessor, no need to (ab)use vJass features in order to make some inferior vJass preprocessor coded "by hand".

[Snippet] Simple Unit Indexer
Reply #14 on: March 13, 2013, 12:52:26 PM
As Troll-Brain said, this needs to retain unit data while they're "out of scope".
The only cool way is by taking advantage of the Defend bug (Credits to all the Wc3c people involved in discovering it (I think PurplePoot or Anitarf mostly?))


[Snippet] Simple Unit Indexer
Reply #15 on: April 11, 2013, 04:57:57 PM
Oftopic; I have been looking for this "Defend Bug", I really want to know what it is, and what you could use it for, but I can't find anything about it (all I find is people having problem with the cap of 10.0 for it in the object editor)


[Snippet] Simple Unit Indexer
Reply #16 on: April 11, 2013, 08:21:05 PM
Quote from: rvonsonsnadtz on April 11, 2013, 04:57:57 PM
Oftopic; I have been looking for this "Defend Bug", I really want to know what it is, and what you could use it for, but I can't find anything about it (all I find is people having problem with the cap of 10.0 for it in the object editor)
As far as I remember...
1. you have a unit, you do damage to it.
2. With a damage detection, you add the defend ability to it before it dies and order him to defend
3. The unit dies.
4. If the unit decays or it really dissapear from the game it will trigger the undefend order, and this will help you to detect properly when it really has to be released from the indexing unit.

I can be wrong, but I've never come with the need of doing this trick :P


[Snippet] Simple Unit Indexer
Reply #17 on: September 30, 2013, 08:07:19 AM
I don't know, but I'll approve this snippet. It's not so bad just for not retaining the index of an already dead unit.


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