random.h

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 * Copyright 2008-2009  Marius Muja (mariusm@cs.ubc.ca). All rights reserved.
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#ifndef _OPENCV_RANDOM_H_
#define _OPENCV_RANDOM_H_

#include <algorithm>
#include <cstdlib>
#include <cassert>

using namespace std;

namespace cvflann
{

CV_EXPORTS void seed_random(unsigned int seed);

/*
 * Generates a random double value.
 */
CV_EXPORTS double rand_double(double high = 1.0, double low=0);

/*
 * Generates a random integer value.
 */
CV_EXPORTS int rand_int(int high = RAND_MAX, int low = 0);


class CV_EXPORTS UniqueRandom
{
        int* vals;
    int size;
        int counter;

public:
        UniqueRandom(int n) : vals(NULL) {
                init(n);
        }

        ~UniqueRandom()
        {
                delete[] vals;
        }

        void init(int n)
        {
        // create and initialize an array of size n
                if (vals == NULL || n!=size) {
            delete[] vals;
                size = n;
            vals = new int[size];
        }
        for(int i=0;i<size;++i) {
                        vals[i] = i;
                }

                // shuffle the elements in the array
        // Fisher-Yates shuffle
                for (int i=size;i>0;--i) {
//                      int rand = cast(int) (drand48() * n);
                        int rnd = rand_int(i);
                        assert(rnd >=0 && rnd < i);
                        swap(vals[i-1], vals[rnd]);
                }

                counter = 0;
        }

        int next() {
                if (counter==size) {
                        return -1;
                } else {
                        return vals[counter++];
                }
        }
};

} // namespace cvflann

#endif //_OPENCV_RANDOM_H_

---

opencv2
Author(s): Gary Bradski and many others. See web page for a full contributor list. ROS package maintained by James Bowman.
autogenerated on Fri Jan 11 10:00:42 2013