added make_pooled, refactor pooling out of vector classes for easy reuse

make_pooled.lua

@@ -1,7 +1,7 @@
 --[[
 	add pooling functionality to a class
 
-	adds a handful of class and instance methods
+	adds a handful of class and instance methods to do with pooling
 ]]
 
 return function(class, limit)
@@ -29,9 +29,11 @@ return function(class, limit)
 	--(re-initialised with new, or freshly constructed if the pool was empty)
 	function class:pooled(...)
 		if #_pool == 0 then
-			return c(...)
+			return class(...)
 		end
-		return c.drain_pool():new(...)
+		local instance = class:drain_pool()
+		instance:new(...)
+		return instance
 	end
 
 	--release a vector to the pool

readme.md

@@ -92,6 +92,7 @@ These modules are probably only useful to some folks in some circumstances, or a
 - [`colour`](./colour.lua) - Colour conversion routines. Alias `color`.
 - [`manual_gc`](./manual_gc.lua) - Get GC out of your update/draw calls. Useful when trying to get accurate profiling information; moves "randomness" of GC. Requires you to think a bit about your garbage budgets though.
 - [`unique_mapping`](./unique_mapping.lua) - Generate a unique mapping from arbitrary lua values to numeric keys - essentially making up a consistent ordering for unordered data. Niche, but can be used to optimise draw batches for example, as you can't sort on textures without it.
+- [`make_pooled`](./make_pooled.lua) - add pooling/recycling capability to a class
 
 Any aliases are provided at both the `batteries` module level, and globally when exported.