1 /***********************************************************************************

     2   random_number.cpp

     3 

     4  * Copyright (c) 1997

     5  * Mark of the Unicorn, Inc.

     6  *

     7  * Permission to use, copy, modify, distribute and sell this software

     8  * and its documentation for any purpose is hereby granted without fee,

     9  * provided that the above copyright notice appear in all copies and

    10  * that both that copyright notice and this permission notice appear

    11  * in supporting documentation.  Mark of the Unicorn makes no

    12  * representations about the suitability of this software for any

    13  * purpose.  It is provided "as is" without express or implied warranty.

    14 

    15 ***********************************************************************************/

    16 #include "random_number.h"

    17 #include "Prefix.h"

    18 #if defined (EH_NEW_HEADERS)

    19 # include <functional>

    20 # include <cstdlib>

    21 #else

    22 # include <function.h>

    23 # include <stdlib.h>

    24 #endif

    25 

    26 unsigned random_number( size_t range )

    27 {

    28 #if !defined( __SGI_STL )

    29   if (range == 0) return 0;

    30   return (unsigned)(EH_STD::rand() + EH_STD::rand()) % range;

    31 #else

    32   static EH_STD::subtractive_rng rnd;

    33         if (range==0) return 0;

    34         return rnd(range);

    35 #endif

    36 }

    37 

    38 // default base for random container sizes

    39 unsigned random_base = 1000;