RPDs can now place disposals pipes on dense non-wall turfs (#2035)

code/__DEFINES/is_helpers.dm

@@ -9,12 +9,16 @@
 //Turfs
 #define isopenturf(A) (istype(A, /turf/open))
 
+#define isindestructiblefloor(A) (istype(A, /turf/open/indestructible))
+
 #define isspaceturf(A) (istype(A, /turf/open/space))
 
 #define isfloorturf(A) (istype(A, /turf/open/floor))
 
 #define isclosedturf(A) (istype(A, /turf/closed))
 
+#define isindestructiblewall(A) (istype(A, /turf/closed/indestructible))
+
 #define iswallturf(A) (istype(A, /turf/closed/wall))
 
 #define ismineralturf(A) (istype(A, /turf/closed/mineral))

code/game/objects/items/weapons/RPD.dm

@@ -570,8 +570,8 @@ GLOBAL_LIST_INIT(RPD_recipes, list(
 				new /obj/item/pipe_meter(A)
 
 		if(DISPOSALS_MODE) //Making disposals pipes
-			if(is_anchored_dense_turf(A))
-				to_chat(user, "<span class='warning'>The [src]'s error light flickers; there's something in the way!</span>")
+			if(isclosedturf(A))
+				to_chat(user, "<span class='warning'>[src]'s error light flickers; there's something in the way!</span>")
 				return
 			to_chat(user, "<span class='notice'>You start building a disposals pipe...</span>")
 			playsound(get_turf(src), 'sound/machines/click.ogg', 50, 1)