[asio] async_write and callback order

Hi all,

I tried to clarify this on the irc but no one was sure about it:
   - when calling async_write multiple times, is there any guarantee 
that the handle_write callback I pass is called in the same order?

For instance, I have the following code:

#include "TCPConnection.h"
#include <boost/bind.hpp>
#include <iostream>

using boost::system::error_code;
using boost::bind;
using namespace boost::asio;
using namespace boost::asio::ip;

namespace SockExperiment
{

 
//---------------------------------------------------------------------------------------
     void TCPConnection::handleWrite(const error_code& error, size_t 
bytes_transferred)
     {
         std::string tmp = mBuffer.front(); // Copy the first element 
for printing
         mBuffer.pop(); // erase the first element

         std::cout << "writen msg \"" << tmp << "\".\n"