【C++】algorithm--shuffle

 shuffle在algorithm当中

// shuffle algorithm example
#include <iostream>     // std::cout
#include <algorithm>    // std::shuffle
#include <array>        // std::array
#include <random>       // std::default_random_engine
#include <chrono>       // std::chrono::system_clock

int main () {
  std::array<int,5> foo {1,2,3,4,5};

  // obtain a time-based seed:
  unsigned seed = std::chrono::system_clock::now().time_since_epoch().count();

  shuffle (foo.begin(), foo.end(), std::default_random_engine(seed));//std::default_random_engine(seed)可以省略

  std::cout << "shuffled elements:";
  for (int& x: foo) std::cout << ' ' << x;
  std::cout << '\n';

  return 0;
}

可能的输出：

shuffled elements: 3 1 4 2 5

转自：http://www.cplusplus.com/reference/algorithm/shuffle/