Re: [boost] [any] new version

Subject: Re: [boost] [any] new version
From: Martin Bidlingmaier (Martin.Bidlingmaier_at_[hidden])
Date: 2011-09-02 14:58:13

So there are actually two main issues that need to be taken care of:

- 1. dlls
  I think a good solution would be to add a new class, e.g. as 
  Andrey Semashev proposed 'local_any', that derives from the current 
  version of any. 
  The normal version could be used for inter dll passing, the new version   
  when the user can assure that a local_any instance won't be passed between
  dlls. 
  Conversion could be provided from local_any to any.

- 2. thread safety
  In c++03, variables defined at namespace scope are not necessarily
  initialized before main(), so there could be data races for the
  previous_id in next_id() in multi threaded applications. 
  One simple way out would be to lock the variabe when used, but this would 
  add the dependency on a threading library (does boost provide 
  locking header only or does it need building?).
  It would be interesting to know, what c++11 says about the initialization
  of static data members. If it prohibits more than one initialization at a 
  time or requires single threaded initialization before main() , 
  locking will not be needed.
-- 
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