[Boost-users] boost::asio - reason for asio_handler_invoke

From: mikpol (mike.polyakov_at_[hidden])
Date: 2008-01-06 16:13:12

Hi,
I've been trying to understand the reasons to have asio_handler_invoke
function, and so far I am unable to understand why it is needed. It is used
to override invocation policy for a function-like object based on the
handler. boost::asio gives one example with using io_service::strand:

template<typename F>
void asio_handler_invoke(F fun, MyHandler* h)
{
  h->strand.invoke(fun);
}

My question is why is it needed to make this function templatized on ANY
function object, and not just MyHandler? Why can't we just define
MyHandler::operator() in terms of strand like this:

struct MyHandler
{
  io_service::strand strand.
  void operator()() {
    strand.invoke(boost::bind(&MyHandler::private_invoke, this));
  }
  void private_invoke() {
    // do stuff...
  }
}

Thanks for any help.
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