text: //
  // detail/reactor_op.hpp
  // ~~~~~~~~~~~~~~~~~~~~~
  //
  // Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
  //
  // Distributed under the Boost Software License, Version 1.0. (See accompanying
  // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  //
  
  #ifndef ASIO_DETAIL_REACTOR_OP_HPP
  #define ASIO_DETAIL_REACTOR_OP_HPP
  
  #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  # pragma once
  #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  
  #include "asio/detail/config.hpp"
  #include "asio/detail/operation.hpp"
  
  #include "asio/detail/push_options.hpp"
  
  namespace asio {
  namespace detail {
  
  class reactor_op
    : public operation
  {
  public:
    // The error code to be passed to the completion handler.
    asio::error_code ec_;
  
    // The number of bytes transferred, to be passed to the completion handler.
    std::size_t bytes_transferred_;
  
    // Status returned by perform function. May be used to decide whether it is
    // worth performing more operations on the descriptor immediately.
    enum status { not_done, done, done_and_exhausted };
  
    // Perform the operation. Returns true if it is finished.
    status perform()
    {
      return perform_func_(this);
    }
  
  protected:
    typedef status (*perform_func_type)(reactor_op*);
  
    reactor_op(perform_func_type perform_func, func_type complete_func)
      : operation(complete_func),
        bytes_transferred_(0),
        perform_func_(perform_func)
    {
    }
  
  private:
    perform_func_type perform_func_;
  };
  
  } // namespace detail
  } // namespace asio
  
  #include "asio/detail/pop_options.hpp"
  
  #endif // ASIO_DETAIL_REACTOR_OP_HPP
  