[問題] 一段語法詢問

[gecer (gecer)]

http://www.cplusplus.com/reference/mutex/mutex/lock/

// mutex::lock/unlock
#include <iostream>       // std::cout
#include <thread>         // std::thread
#include <mutex>          // std::mutex

std::mutex mtx;           // mutex for critical section

void print_thread_id (int id) {
  // critical section (exclusive access to std::cout signaled by locking mtx):
  mtx.lock();
  std::cout << "thread #" << id << '\n';
  mtx.unlock();
}

int main ()
{
  std::thread threads[10];
  // spawn 10 threads:
  for (int i=0; i<10; ++i)
    threads[i] = std::thread(print_thread_id,i+1);

  for (auto& th : threads) th.join();

  return 0;
}

請問黃字 auto 的意思? 是不是等於foreach loop?

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※ 編輯: gecer (111.255.14.8), 03/24/2018 08:53:29
※ 編輯: gecer (111.255.14.8), 03/24/2018 08:53:44
※ 編輯: gecer (111.255.14.8), 03/24/2018 08:54:19
推 stupid0319: 自動指定類型?
推 steve1012: 讓編譯器推導type 跟你想說的一樣
推 gus2: http://en.cppreference.com/w/cpp/language/range-for
→ gus2: http://en.cppreference.com/w/cpp/language/auto
推 jerryh001: "auto"是自動推定 那一整段的寫法是forloop
→ jerryh001: *foreach loop