Re: [boost] interest in a stateful pointer library?

Subject: Re: [boost] interest in a stateful pointer library?
From: Peter Dimov (lists_at_[hidden])
Date: 2017-10-09 09:37:55

Hans Dembinski wrote:

> This is kinda sad, because the library is much less useful if tagged_ptr 
> is not guaranteed to work on all platforms now and in the future. Just 
> assume you use this in a large project and rely on it, and then a new 
> processor generation comes out where tagged_ptr does not work anymore. 
> That being said it is probably still useful for special projects, but not 
> something to put in Boost. :(

On the contrary, this is exactly why it needs to be put in Boost - to 
isolate the platform-specific differences behind a portable interface.

> but smart people on Reddit showed me that I am relying on undefined 
> behaviour here.

Out of curiosity, what's the specific problem that was pointed out? What 
behavior is undefined?