1 (* Copyright (C) 2000, HELM Team.
3 * This file is part of HELM, an Hypertextual, Electronic
4 * Library of Mathematics, developed at the Computer Science
5 * Department, University of Bologna, Italy.
7 * HELM is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
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13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with HELM; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
22 * For details, see the HELM World-Wide-Web page,
23 * http://www.cs.unibo.it/helm/.
27 * implementazione dei comandi LETIN e REF
32 let letin_pool = ref None;;
35 match !letin_pool with
36 None -> print_endline "None"
37 | Some c -> List.iter (fun elem -> print_endline (fst elem)) c
40 let letin_ex rvar alist =
42 match !letin_pool with
43 Some pool -> letin_pool := Some ((rvar,alist)::(List.remove_assoc rvar pool))
44 | None -> letin_pool := Some ([(rvar,alist)])
46 (* let _ = see_pool () in*)
51 match !letin_pool with
63 let _ = letin_pool = ref None in ()