// This file is part of OpenCV project.
// It is subject to the license terms in the LICENSE file found in the top-level
// directory of this distribution and at http://opencv.org/license.html.

#ifndef OPENCV_CORE_ASYNC_PROMISE_HPP
#define OPENCV_CORE_ASYNC_PROMISE_HPP

#include "../async.hpp"

#include "exception_ptr.hpp"

namespace cv {

/** @addtogroup core_async
@{
*/

/** @brief Provides result of asynchronous operations

*/
class CV_EXPORTS AsyncPromise {
public:
  ~AsyncPromise() CV_NOEXCEPT;
  AsyncPromise() CV_NOEXCEPT;
  explicit AsyncPromise(const AsyncPromise &o) CV_NOEXCEPT;
  AsyncPromise &operator=(const AsyncPromise &o) CV_NOEXCEPT;
  void release() CV_NOEXCEPT;

  /** Returns associated AsyncArray
  @note Can be called once
  */
  AsyncArray getArrayResult();

  /** Stores asynchronous result.
  @param[in] value result
  */
  void setValue(InputArray value);

  // TODO "move" setters

#if CV__EXCEPTION_PTR
  /** Stores exception.
  @param[in] exception exception to be raised in AsyncArray
  */
  void setException(std::exception_ptr exception);
#endif

  /** Stores exception.
  @param[in] exception exception to be raised in AsyncArray
  */
  void setException(const cv::Exception &exception);

  explicit AsyncPromise(AsyncPromise &&o) {
    p = o.p;
    o.p = NULL;
  }
  AsyncPromise &operator=(AsyncPromise &&o) CV_NOEXCEPT {
    std::swap(p, o.p);
    return *this;
  }

  // PImpl
  typedef struct AsyncArray::Impl Impl;
  friend struct AsyncArray::Impl;
  inline void *_getImpl() const CV_NOEXCEPT { return p; }

protected:
  Impl *p;
};

//! @}
} // namespace cv
#endif // OPENCV_CORE_ASYNC_PROMISE_HPP