84 lines
2.6 KiB
C++
84 lines
2.6 KiB
C++
/*
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* CDE - Common Desktop Environment
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*
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* Copyright (c) 1993-2012, The Open Group. All rights reserved.
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*
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* These libraries and programs are free software; you can
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* redistribute them and/or modify them under the terms of the GNU
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* Lesser General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* These libraries and programs are distributed in the hope that
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* they will be useful, but WITHOUT ANY WARRANTY; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU Lesser General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with these libraries and programs; if not, write
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* to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
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* Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* $XConsortium: pm_random.h /main/4 1996/06/11 17:38:21 cde-hal $
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*
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* Copyright (c) 1992 HAL Computer Systems International, Ltd.
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* All rights reserved. Unpublished -- rights reserved under
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* the Copyright Laws of the United States. USE OF A COPYRIGHT
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* NOTICE IS PRECAUTIONARY ONLY AND DOES NOT IMPLY PUBLICATION
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* OR DISCLOSURE.
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*
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* THIS SOFTWARE CONTAINS CONFIDENTIAL INFORMATION AND TRADE
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* SECRETS OF HAL COMPUTER SYSTEMS INTERNATIONAL, LTD. USE,
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* DISCLOSURE, OR REPRODUCTION IS PROHIBITED WITHOUT THE
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* PRIOR EXPRESS WRITTEN PERMISSION OF HAL COMPUTER SYSTEMS
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* INTERNATIONAL, LTD.
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*
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* RESTRICTED RIGHTS LEGEND
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* Use, duplication, or disclosure by the Government is subject
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* to the restrictions as set forth in subparagraph (c)(l)(ii)
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* of the Rights in Technical Data and Computer Software clause
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* at DFARS 252.227-7013.
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*
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* HAL COMPUTER SYSTEMS INTERNATIONAL, LTD.
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* 1315 Dell Avenue
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* Campbell, CA 95008
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*
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*/
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#ifndef _pm_random_h
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#define _pm_random_h 1
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#include "utility/macro.h"
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#include "utility/funcs.h"
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// from CACM 88.10 Park and Miller's paper.
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// rewritten to have important member functions inline.
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class pm_random {
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public:
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pm_random(int sd = 19) ;
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virtual ~pm_random() {};
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void seed(int = 19);
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int initial_seed() { return v_i_seed; };
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int current_seed() { return v_new_seed; };
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int rand() {
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int tmp = v_new_seed;
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int test = 16807 * (v_new_seed % 127773) - 2836 * (v_new_seed / 127773);
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v_new_seed = ( test > 0 ) ? test : test + 2147483647;
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return tmp;
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};
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float rand_01() { return float(rand()) / 2147483647.0; };
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private:
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int v_new_seed;
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int v_i_seed;
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};
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#endif
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