Re: [boost] Solving Robert's singleton problem

Subject: Re: [boost] Solving Robert's singleton problem
From: Peter Dimov (lists_at_[hidden])
Date: 2018-10-18 21:58:30

Robert Ramey wrote:

> I'm quite confident that the problem will be solved in the near future 
> just by doing the work to fix it.  It's not rocket science, it just 
> requires investment of time and effort by someone who understands the 
> library and C++

The problem has already been fixed, by Alexander Grund. The fix, in its 
latest incarnation, is in #131.

To recap,

- the Serialization library crashes on exit in certain scenarios, as 
demonstrated by the tests in #111 and #128.

- this is caused by the fact that singleton<X>::is_destroyed() always 
returns false, as demonstrated by the test in #129.

(At extended_type_info_typeid.cpp:99, the code tests 
singleton<tkmap>::is_destroyed(), and if false, proceeds to use 
singleton<tkmap>::get_mutable_instance(). But since is_destroyed always 
returns false, the check doesn't work and doesn't prevent the library from 
accessing the destroyed tkmap in the scenario in question.)

- a fix for is_destroyed() is proposed in #131. It makes the tests from 
#111/#128/#129 pass.