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50 lines
1.0 KiB
50 lines
1.0 KiB
// HtRandom.h
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//
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// class HtRandom:
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// tools for random numbers
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//
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// Part of the ht://Dig package <http://www.htdig.org/>
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// Copyright (c) 1999-2004 The ht://Dig Group
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// For copyright details, see the file COPYING in your distribution
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// or the GNU Library General Public License (LGPL) version 2 or later
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// <http://www.gnu.org/copyleft/lgpl.html>
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//
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// $Id: HtRandom.h,v 1.5 2004/05/28 13:15:21 lha Exp $
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//
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#ifndef _HtRandom_h_
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#define _HtRandom_h_
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class HtRandom
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{
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public:
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// produce a random unsigned int between v0 and v1
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static inline unsigned int rnd(unsigned int v0,unsigned int v1)
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{
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return((rand()%(v1-v0)) + v0 );
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}
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// randomly mix up an array of int's
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static int *randomize_v(int *vals,int n)
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{
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int i;
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if(!vals)
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{
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vals=new int[n];
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for(i=0;i<n;i++){vals[i]=i;}
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}
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for(i=0;i<2*n;i++)
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{
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int i0=HtRandom::rnd(0,n);
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int i1=HtRandom::rnd(0,n);
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int t=vals[i0];
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vals[i0]=vals[i1];
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vals[i1]=t;
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}
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return(vals);
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}
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};
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#endif // _HtRandom_h_
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