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- #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
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