Re: [Boost-users] [shared_ptr] Multiple enable_shared_from_this in inheritance tree

Subject: Re: [Boost-users] [shared_ptr] Multiple enable_shared_from_this in inheritance tree
From: Edward Diener (eldiener_at_[hidden])
Date: 2012-03-27 19:56:24

On 3/27/2012 5:08 AM, ivan.lelann_at_[hidden] wrote:
>
>snip...
>> My main point is that if having more than one
>> enable_shared_from_this<>
>> in the inheritance hierarchy normally fails, this should be
>> documented
>> with the proper information on how to workaround the problem.
>>
>
> I agree.
>
> I wondered how current C++11 standard libraries handled this.
> With VS2010, replacing "boost" with "std" made both "shared_from_this()" calls throw.
> (with two esft bases the compiler chooses a dummy specialization)

I think it is quite simply that there can not be more than one 
enable_shared_from_this derivation in a hierarchy. Unfortunately one is 
left to discover this for himself.

Similarly there is no mention in the docs that using shared_from_this() 
during construction is not going to work either.

The documentation for enable_shared_from_this needs to be better.