Re: [Boost-bugs] [Boost C++ Libraries] #3627: boost::asio::async_read() cannot be used with null_buffers()

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #3627: boost::asio::async_read() cannot be used with null_buffers()
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2010-01-12 21:28:46

#3627: boost::asio::async_read() cannot be used with null_buffers()
----------------------------------------------------------------+-----------
 Reporter:  Dmitry Goncharov <dgoncharov@…>                     |       Owner:  chris_kohlhoff
     Type:  Bugs                                                |      Status:  new           
Milestone:  Boost 1.41.0                                        |   Component:  asio          
  Version:  Boost 1.40.0                                        |    Severity:  Problem       
 Keywords:  asio async_read null_buffers                        |  
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Changes (by chris_kohlhoff):

  * severity:  Regression => Problem

Comment:

 Not a regression. The null_buffers() type never worked with async_read().

 You may confirm that it doesn't work by making the following changes to
 the nonblocking example:

 @@ -117,7 +117,8 @@
      if (session_impl_.want_read() && !read_in_progress_)
      {
        read_in_progress_ = true;
 -      socket_.async_read_some(
 +      boost::asio::async_read(socket_,
 +      //socket_.async_read_some(
            boost::asio::null_buffers(),
            boost::bind(&connection::handle_read,
              shared_from_this(),
 @@ -138,6 +139,8 @@

    void handle_read(boost::system::error_code ec)
    {
 +    printf("handle_read\n");
 +
      read_in_progress_ = false;

      // Notify third party library that it can perform a read.

 I just checked against 1.39.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/3627#comment:2>
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