Re: [Boost-users] multiple levels of bind nesting

Subject: Re: [Boost-users] multiple levels of bind nesting
From: Zachary Turner (divisortheory_at_[hidden])
Date: 2009-07-22 17:13:00

On Wed, Jul 22, 2009 at 4:04 PM, Steven Watanabe<watanabesj_at_[hidden]> wrote:
> AMDG
>
> Zachary Turner wrote:
>>
>> <snip>
>>
>> void client::start_work()
>> {
>>   apply_visitor(
>>       bind(do_work_visitor(), _1,
>>           protect(bind(&client::work_finished, this, _1, _2)))
>>       , work_variant_);
>> }
>> <snip>
>>
>>    template<class Handler>
>>    void async_do_work(Handler h)
>>    {
>>       //impl supports the same basic interface as worker
>>
>>       impl->async_do_work(
>>          bind(&worker::intercept_handler<Handler>, this, h, _1, _2));
>>    }
>>
>
> Since h is a bind expression it needs to be protect'ed.

Yes I tried that as well but was not able to get it working.  Anyway I
never got it to work but I tried Emil's suggestion of using
boost::function and that fixed the problem.  I'm sure I was just doing
something wrong, or perhaps dealing with compiler non-comformance
issues, but the error messages are very difficult to diagnose
sometimes, and will sometimes appear on functions that are not even
the one causing the problem.  In this case for example the error
referred to the apply_visitor() line of code and there was no mention
in the error logs of the line of code containing the bind inside of
async_do_work, even though that was clearly where the problem was.