Undo.AddFunction

{{Lua_function |
  function_name        = undo.AddFunction|
  arguments            = {{Arg|Function}} func, ... |
  lua_state            = {{Serverside}} |
  library              = {{Arg|Undo}} |
  description          = Adds a function to call to the existing undo block.
}}

== Examples ==
{{Lua_example |
  description = Spawns a wooden box, and displays a what is passed to the function when the spawn is undone. |
  code = <lua>prop = ents.Create("prop_physics")
prop:SetModel("models/props_junk/wood_crate001a.mdl")
prop:Spawn()
undo.Create("prop")
    undo.AddEntity(prop)
    undo.AddFunction( PrintTable )
    undo.SetPlayer(Player)
undo.Finish()</lua> |
  useOn = {{Serverside}}|
  output = <pre>Owner	=	Player [1][Lexi]
Entities:
		1	=	Entity [58][prop_physics]
Name	=	prop
Functions:
		1:
				1	=	function: 02840A80
				2:
						n	=	0</pre>|
}}
{{Lua_example |
  description = Slightly more advanced, uses the structure found by looking at the previous example and puts it to use |
  code = <lua>prop = ents.Create("prop_physics")
prop:SetModel("models/props_junk/wood_crate001a.mdl")
prop:Spawn()
undo.Create("prop")
    undo.AddEntity(prop)
    undo.AddFunction(function(undo)
		Msg(undo.Owner:GetName().." removed prop "..undo.Entities[1]:GetModel()..".\n")
	end)
    undo.SetPlayer(Player)
undo.Finish()</lua> |
  useOn = {{Serverside}}|
  output = Lexi removed prop models/props_junk/wood_crate001a.mdl.|
}}

==Additional Notes==
* The called function is first passed a table with all the data fed into the undo, before being passed the arguments specified. Therefore, it is advisable to create your own inline function.

==See Also==
* [[Undo.Create]]
* [[Undo.Finish]]
* {{Codebase|lua/includes/modules/undo.lua undo.lua}}