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1
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2
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type ('a, 'b) t = Memo : ('a, 'b) Hashtbl.t -> ('a, 'b) t;;
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3
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4
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let create () = Memo (Hashtbl.create 97);;
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5
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6
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let reset (Memo hashf) =
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7
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begin
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8
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Hashtbl.reset hashf
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9
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end
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10
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11
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let fold (Memo hashf) f e =
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12
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begin
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13
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Hashtbl.fold f hashf e
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14
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end;;
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15
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16
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let apply (Memo hashf) f =
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17
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fun x ->
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18
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try
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19
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Log.log ~debug:false (fun fmt -> Format.fprintf fmt "lookup 1@.");
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20
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Hashtbl.find hashf x
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21
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with Not_found ->
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22
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let res = f x in
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23
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begin
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24
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Log.log ~debug:false (fun fmt -> Format.fprintf fmt "hashing 1@.");
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25
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Hashtbl.add hashf x res;
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26
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res
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27
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end;;
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28
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29
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let apply2 (Memo hashf) f =
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30
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fun x y ->
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31
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try
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32
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Log.log ~debug:false (fun fmt -> Format.fprintf fmt "lookup 2@.");
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33
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Hashtbl.find hashf (x, y)
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34
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with Not_found ->
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35
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let res = f x y in
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36
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begin
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37
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Log.log ~debug:false (fun fmt -> Format.fprintf fmt "hashing 2@.");
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38
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Hashtbl.add hashf (x, y) res;
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39
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res
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40
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end;;
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41
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42
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let apply3 (Memo hashf) f =
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43
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fun x y z ->
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44
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try
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45
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Log.log ~debug:false (fun fmt -> Format.fprintf fmt "lookup 3@.");
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46
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Hashtbl.find hashf (x, y, z)
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47
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with Not_found ->
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48
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let res = f x y z in
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49
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begin
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50
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Log.log ~debug:false (fun fmt -> Format.fprintf fmt "hashing 3@.");
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51
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Hashtbl.add hashf (x, y, z) res;
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52
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res
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53
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end;;
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