From 96e45ecbf31c5685fa914882ec4b21b1392c49fc Mon Sep 17 00:00:00 2001
From: Helmut Grohne <helmut@subdivi.de>
Date: Fri, 5 Oct 2012 10:58:15 +0200
Subject: remove VecRevBFF

The case is not interesting, because it is too restricted. The defined
get-type requires a bijection between input length and output length.
Since it requires polymorphism we get a reverse get-len via free
theorems and both compositions are required to be identities. Thus the
case is restricted without providing new insights.
---
 BFF.agda | 21 ---------------------
 1 file changed, 21 deletions(-)

(limited to 'BFF.agda')

diff --git a/BFF.agda b/BFF.agda
index 9d132ff..546782d 100644
--- a/BFF.agda
+++ b/BFF.agda
@@ -58,24 +58,3 @@ module VecBFF where
                        h  = assoc eq (get s′) v
                        h′ = fmap (flip union g) h
                    in fmap (flip mapV s′ ∘ flip lookupV) h′
-
-module VecRevBFF where
-  get-type : (ℕ → ℕ) → Set₁
-  get-type getlen = {A : Set} {n : ℕ} → Vec A (getlen n) → Vec A n
-
-  assoc : {A : Set} {m n : ℕ} → EqInst A → Vec (Fin m) n → Vec A n → Maybe (FinMapMaybe m A)
-  assoc _  []V       []V       = just empty
-  assoc eq (i ∷V is) (b ∷V bs) = (assoc eq is bs) >>= (checkInsert eq i b)
-
-  enumerate : {A : Set} {n : ℕ} → Vec A n → Vec (Fin n) n
-  enumerate _ = tabulate id
-
-  denumerate : {A : Set} {n : ℕ} → Vec A n → Fin n → A
-  denumerate = flip lookupV
-
-  bff : {getlen : ℕ → ℕ} → (get-type getlen) → ({m : ℕ} {B : Set} → EqInst B → Vec B (getlen m) → Vec B m → Maybe (Vec B (getlen m)))
-  bff get eq s v = let s′ = enumerate s
-                       g  = fromFunc (denumerate s)
-                       h  = assoc eq (get s′) v
-                       h′ = fmap (flip union g) h
-                   in fmap (flip mapV s′ ∘ (flip lookup)) h′
-- 
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