38 lines
1010 B
C++
38 lines
1010 B
C++
#ifndef BOOST_MOVE_TEST_RANDOM_SHUFFLE_HPP
|
|
#define BOOST_MOVE_TEST_RANDOM_SHUFFLE_HPP
|
|
|
|
|
|
#include <boost/move/adl_move_swap.hpp>
|
|
#include <boost/move/detail/iterator_traits.hpp>
|
|
#include <stdlib.h>
|
|
|
|
inline unsigned long long rand_15_bit()
|
|
{
|
|
//Many rand implementation only use 15 bits
|
|
//so make sure we have only 15 bits
|
|
return (unsigned long long)((std::rand()) & 0x7fffu);
|
|
}
|
|
|
|
inline unsigned long long ullrand()
|
|
{
|
|
return (rand_15_bit() << 54u) ^ (rand_15_bit() << 39u)
|
|
^ (rand_15_bit() << 26u) ^ (rand_15_bit() << 13u)
|
|
^ rand_15_bit();
|
|
}
|
|
|
|
template< class RandomIt >
|
|
void random_shuffle( RandomIt first, RandomIt last )
|
|
{
|
|
typedef typename boost::movelib::iterator_traits<RandomIt>::difference_type difference_type;
|
|
difference_type n = last - first;
|
|
for (difference_type i = n-1; i > 0; --i) {
|
|
difference_type j = ullrand() % (i+1);
|
|
if(j != i) {
|
|
boost::adl_move_swap(first[i], first[j]);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
#endif// BOOST_MOVE_TEST_RANDOM_SHUFFLE_HPP
|