linux-sgx-trts-modified/sdk/edger8r/linux/SimpleStack.ml

(*
 * Copyright (C) 2011-2016 Intel Corporation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
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 *   * Redistributions in binary form must reproduce the above copyright
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 *     distribution.
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 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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 *)

type 'a t = { mutable c : 'a list }
exception Empty
let create () = { c = [] }
let push x s = s.c <- x :: s.c
let pop s =
  match s.c with
      hd::tl -> s.c <- tl; hd
    | []     -> raise Empty
let mem x s = List.mem x s.c