# HG changeset patch
# User Rob Hoes <rob.hoes@xxxxxxxxxx>
CP-1622: Listext function to replace the value for a key in an assoc list

Signed-off-by: Rob Hoes <rob.hoes@xxxxxxxxxx>

diff -r 3e1beafe76b5 stdext/listext.ml
--- a/stdext/listext.ml	Tue Feb 16 22:40:11 2010 +0000
+++ b/stdext/listext.ml	Tue Feb 16 22:47:58 2010 +0000
@@ -192,4 +192,13 @@
 let rec tails = function
     | [] -> [[]]
     | (_::xs) as l -> l :: tails xs
+
+let rec replace_assoc key new_value = function
+	| [] -> []
+	| (k, _) as p :: tl ->
+		if k = key then
+			(key, new_value) :: tl
+		else
+			p :: replace_assoc key new_value tl
+
 end
diff -r 3e1beafe76b5 stdext/listext.mli
--- a/stdext/listext.mli	Tue Feb 16 22:40:11 2010 +0000
+++ b/stdext/listext.mli	Tue Feb 16 22:47:58 2010 +0000
@@ -177,4 +177,6 @@
 	
     val tails : 'a list -> ('a list) list
 
+	(** Replace the value belonging to a key in an association list. *)
+	val replace_assoc : 'a -> 'b -> ('a * 'b) list -> ('a * 'b) list
   end