C++ random_shuffle用法

参考 http://www.cplusplus.com/reference/algorithm/random_shuffle/

/* template <class RandomAccessIterator, class RandomNumberGenerator> void random_shuffle (RandomAccessIterator first, RandomAccessIterator last, RandomNumberGenerator& gen) { iterator_traits<RandomAccessIterator>::difference_type i, n; n = (last-first); for (i=n-1; i>0; --i) { swap (first[i],first[gen(i+1)]); } } */
// random_shuffle example
#include <iostream> // std::cout
#include <algorithm> // std::random_shuffle
#include <vector> // std::vector
#include <ctime> // std::time
#include <cstdlib> // std::rand, std::srand

// random generator function:
int myrandom (int i) { 
    return std::rand()%i;}

int main () { 
   
  std::srand ( unsigned ( std::time(0) ) );
  std::vector<int> myvector;

  // set some values:
  for (int i=1; i<10; ++i) myvector.push_back(i); // 1 2 3 4 5 6 7 8 9

  // using built-in random generator:
  std::random_shuffle ( myvector.begin(), myvector.end() );

  // using myrandom:
  std::random_shuffle ( myvector.begin(), myvector.end(), myrandom);

  // print out content:
  std::cout << "myvector contains:";
  for (std::vector<int>::iterator it=myvector.begin(); it!=myvector.end(); ++it)
    std::cout << ' ' << *it;

  std::cout << '\n';

  return 0;
}

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