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-/***********************************************************************
- * Software License Agreement (BSD License)
- *
- * Copyright 2008-2009 Marius Muja (mariusm@cs.ubc.ca). All rights reserved.
- * Copyright 2008-2009 David G. Lowe (lowe@cs.ubc.ca). All rights reserved.
- *
- * THE BSD LICENSE
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *************************************************************************/
-
-#ifndef OPENCV_FLANN_RANDOM_H
-#define OPENCV_FLANN_RANDOM_H
-
-#include <algorithm>
-#include <cstdlib>
-#include <vector>
-
-#include "general.h"
-
-namespace cvflann
-{
-
-/**
- * Seeds the random number generator
- * @param seed Random seed
- */
-inline void seed_random(unsigned int seed)
-{
- srand(seed);
-}
-
-/*
- * Generates a random double value.
- */
-/**
- * Generates a random double value.
- * @param high Upper limit
- * @param low Lower limit
- * @return Random double value
- */
-inline double rand_double(double high = 1.0, double low = 0)
-{
- return low + ((high-low) * (std::rand() / (RAND_MAX + 1.0)));
-}
-
-/**
- * Generates a random integer value.
- * @param high Upper limit
- * @param low Lower limit
- * @return Random integer value
- */
-inline int rand_int(int high = RAND_MAX, int low = 0)
-{
- return low + (int) ( double(high-low) * (std::rand() / (RAND_MAX + 1.0)));
-}
-
-/**
- * Random number generator that returns a distinct number from
- * the [0,n) interval each time.
- */
-class UniqueRandom
-{
- std::vector<int> vals_;
- int size_;
- int counter_;
-
-public:
- /**
- * Constructor.
- * @param n Size of the interval from which to generate
- * @return
- */
- UniqueRandom(int n)
- {
- init(n);
- }
-
- /**
- * Initializes the number generator.
- * @param n the size of the interval from which to generate random numbers.
- */
- void init(int n)
- {
- // create and initialize an array of size n
- vals_.resize(n);
- size_ = n;
- for (int i = 0; i < size_; ++i) vals_[i] = i;
-
- // shuffle the elements in the array
- std::random_shuffle(vals_.begin(), vals_.end());
-
- counter_ = 0;
- }
-
- /**
- * Return a distinct random integer in greater or equal to 0 and less
- * than 'n' on each call. It should be called maximum 'n' times.
- * Returns: a random integer
- */
- int next()
- {
- if (counter_ == size_) {
- return -1;
- }
- else {
- return vals_[counter_++];
- }
- }
-};
-
-}
-
-#endif //OPENCV_FLANN_RANDOM_H