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std::random_shuffle and boost/random.hpp

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use boost random algolism in std::random_shuffle

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  1. #include <iostream>
  2. #include <ctime>
  3. #include <boost/random.hpp>
  4.  
  5. class Random
  6. {
  7. public:
  8.   boost::mt19937 gen;
  9.   boost::uniform_int<int> dst;
  10.   boost::variate_generator< boost::mt19937, boost::uniform_int<int> > rand;
  11.   Random( int N ):// call instance:
  12.     gen( static_cast<unsigned long>(std::time(0)) ), dst( 0, N ), rand( gen, dst ) {
  13.   }
  14.   std::ptrdiff_t operator()( std::ptrdiff_t arg ) {
  15.     return static_cast< std::ptrdiff_t >( rand() );
  16.   }
  17. };
  18.  
  19. int main () {
  20.   srand ( unsigned ( time (NULL) ) );
  21.   std::vector<int> myvector;
  22.   std::vector<int>::iterator it;
  23.   Random rnd( 10 );
  24.  
  25.   // set some values:
  26.   for (int i=0; i<10; ++i) myvector.push_back(i); // 0 1 2 3 4 5 6 7 8 9
  27.  
  28.   // using built-in random generator:
  29.   std::random_shuffle ( myvector.begin(), myvector.end() );
  30.  
  31.   // using myrandom:
  32.   std::random_shuffle ( myvector.begin(), myvector.end(), rnd);
  33.  
  34.   // print out content:
  35.   std::cout << "myvector contains:";
  36.   for (it=myvector.begin(); it!=myvector.end(); ++it)
  37.     std::cout << " " << *it;
  38.  
  39.   std::cout << std::endl;
  40.   return 0;
  41. }

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