--[[
| This file was obtained through the combined efforts
| of Madbluntz & Plymouth Antiquarian Society.
|
| Credits: lifestorm, Gregory Wayne Rossel JR.,
| 	Maloy, DrPepper10 @ RIP, Atle!
|
| Visit for more: https://plymouth.thetwilightzone.ru/
--]]


function ents.FindByClassAndParent( classname, entity )

	if ( !IsValid( entity ) ) then return end

	local list = ents.FindByClass( classname )
	if ( !list ) then return end

	local out = {}
	for k, v in ipairs( list ) do

		if ( !IsValid(v) ) then continue end

		local p = v:GetParent()
		if ( !IsValid(p) ) then continue end
		if ( p != entity ) then continue end

		table.insert( out, v )

	end

	if ( #out == 0 ) then return end

	return out

end



local inext = ipairs({})
local EntityCache = nil

function ents.Iterator()

	if ( EntityCache == nil ) then EntityCache = ents.GetAll() end

	return inext, EntityCache, 0

end

local function InvalidateEntityCache( ent )

	EntityCache = nil

end

hook.Add( "OnEntityCreated", "ents.Iterator", InvalidateEntityCache )
hook.Add( "EntityRemoved", "ents.Iterator", InvalidateEntityCache )