The following code example is taken from the book
The C++ Standard Library - A Tutorial and Reference, 2nd Edition
by Nicolai M. Josuttis, Addison Wesley Longman, 2012
Copyright © 2012 by Pearson Education, Inc. and Nicolai M. Josuttis
#include <cstdlib>
#include "algostuff.hpp"
using namespace std;
class MyRandom {
public:
ptrdiff_t operator() (ptrdiff_t max) {
double tmp;
tmp = static_cast<double>(rand())
/ static_cast<double>(RAND_MAX);
return static_cast<ptrdiff_t>(tmp * max);
}
};
int main()
{
vector<int> coll;
INSERT_ELEMENTS(coll,1,9);
PRINT_ELEMENTS(coll,"coll: ");
// shuffle elements with self-written random-number generator
MyRandom rd;
random_shuffle (coll.begin(), coll.end(), // range
rd); // random-number generator
PRINT_ELEMENTS(coll,"shuffled: ");
}