Just a quick look but i have a quick question,

Write method require as second param a buffer; te axample you suggested pass shared_const_buffer which does not implements any  interface.

I suppose the trick should be in these lines

  typedef boost::asio::const_buffer value_type;

  typedef const boost::asio::const_buffer* const_iterator;

but I don’t know why.

 Can you explain me the trick ?

Thanks

Matteo

From: boost-users-bounces@lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of ecyrbe
Sent: sabato 10 luglio 2010 16:48
To: boost-users@lists.boost.org
Subject: Re: [Boost-users] asio::async_write, how to delete data after

see the reference_counted example in the boost asio documentation. It's a good start to allow dynamic buffer allocation and auto deletion when your message is delivered...

2010/7/10 Matteo Lanzi <matteo.lanzi@kaseya.com>

Hi, I modified a little the echo server example and to build up a simple tcp server; basically what I do is:

- Start the server in a thread

- When a session is created I start  async read

- If my session receive a signal I  write a data with async write function

- Handle data written then start again async read ( otherwise the connection should be closed )

I have some specific functions which prepare packets and then invoke the write method

I would like to avoid static allocation of my buffer instead of dynamic one; for doing that I supposed to use shared_array<T>

I can’t do that because the boost::asio::buffer, required by the write method, doesn’t seem to accept smart pointer.

So my questions are:

- Is there a common pattern to follow for preparing data and delete them after the delivery ?

- Is it possible to use smart pointers with async_write ?

- Is the async_write executed in another thread ? should I have concurrency problems if I would use an unique output buffer and clear it on the handle_write callback ?

Thanks

Matteo

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