shared_queue using ModyCamel's lock-free queue

// 2015 by KjellKod.cc
// A lock-free in-place version of the shared-queue used in g2log and g3log
// instead of the normal shared-queue https://github.com/KjellKod/g3log/blob/e219a5e426d329a4a4c85aee92ec6eacc43a7125/src/shared_queue.hpp
// it wraps Moody Camel's lock-free queue
// http://moodycamel.com/blog/2014/detailed-design-of-a-lock-free-queue
#pragma once

#include "concurrentqueue.hpp"


#include <thread>

/** Multiple producer, multiple consumer thread safe queue
* Since 'return by reference' is used this queue won't throw */
template<typename T>
class shared_queue
{
  moodycamel::ConcurrentQueue<T> queue_;
queue_;
  shared_queue& operator=(const shared_queue&) = delete;
  shared_queue(const shared_queue& other) = delete;

public:
  shared_queue(){}

  void push(T item){ 
      queue_.enqueue(std::move(item));
  }

  /// Try to retrieve, if no items, wait till an item is available and try again
  void wait_and_pop(T& popped_item){

    while(true) {
      if (queue_.try_dequeue(popped_item)) {
        break;
      }
      else {
         std::this_thread::yield();
      }
    }
  }
};