37 lines
962 B
C++
37 lines
962 B
C++
#ifndef BOOST_MOVE_TEST_RANDOM_SHUFFLE_HPP
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#define BOOST_MOVE_TEST_RANDOM_SHUFFLE_HPP
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#include <boost/move/adl_move_swap.hpp>
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#include <boost/move/detail/iterator_traits.hpp>
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#include <stdlib.h>
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inline unsigned long long rand_15_bit()
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{
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//Many rand implementation only use 15 bits
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//so make sure we have only 15 bits
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return (unsigned long long)((std::rand()) & 0x7fff);
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}
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inline unsigned long long ullrand()
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{
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return (rand_15_bit() << 54u) ^ (rand_15_bit() << 39u)
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^ (rand_15_bit() << 26u) ^ (rand_15_bit() << 13u)
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^ rand_15_bit();
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}
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template< class RandomIt >
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void random_shuffle( RandomIt first, RandomIt last )
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{
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std::size_t n = std::size_t (last - first);
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for (std::size_t i = n-1; i > 0; --i) {
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std::size_t j = static_cast<std::size_t >(ullrand() % (unsigned long long)(i+1));
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if(j != i) {
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boost::adl_move_swap(first[i], first[j]);
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}
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}
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}
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#endif// BOOST_MOVE_TEST_RANDOM_SHUFFLE_HPP
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