Re: [Boost-users] asio::async_write

Subject: Re: [Boost-users] asio::async_write
From: Juraj Ivančić (juraj.ivancic_at_[hidden])
Date: 2009-11-18 11:54:24

Lloyd wrote:

>> Creating asynchronous operation handlers on stack does not make much
>> sense.
>>
> 
> Why do you say this? Is there any chance of crashing the application?

Correction of my previous statement: It does not make sense to pass 
member function bound to a stack allocated object as an asynchronous
operation handler.

Passed handler must remain valid until async operation is completed
i.e. until it gets called. The shared_ptr trick is a way to ensure that,
because handler itself owns a shared pointer to the object in question 
thus assuring its still valid.

Your example is perfectly safe because it will do nothing - you are not 
running io_service in a separate thread, so async operation will never
even start.

You might want to have a look at asynchronous examples in asio 
documentation.