[Boost-bugs] [Boost C++ Libraries] #5768: any_cast

Subject: [Boost-bugs] [Boost C++ Libraries] #5768: any_cast
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2011-08-10 12:21:09

#5768: any_cast
-----------------------------------+----------------------------------------
 Reporter:  a.khawaldeh@…          |       Owner:  nasonov
     Type:  Bugs                   |      Status:  new    
Milestone:  To Be Determined       |   Component:  any    
  Version:  Boost 1.47.0           |    Severity:  Problem
 Keywords:                         |  
-----------------------------------+----------------------------------------
 assume we have a class Base, and other class Derived that inherits Base.

 I can write
 {{{
 boost::any a = new Derived;
 }}}
 so, the following code
 {{{
 Derived* d = any_cast<Derived*>(a);
 }}}
 will work good, but!!
 {{{
 Base* b = any_cast<Base*>(a);
 }}}
 will fail.

 i.e boost::any_cast could not work with inheritance and polymorphism.

 You may wonder why this is needed? but I did faced this case.

 I solved this problem in '''boost::any''' on my machine, and I thought to
 share this with others, so if this sounds useful to you, please tell me
 how can I add my code to boost

 many thanks.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/5768>
Boost C++ Libraries <http://www.boost.org/>
Boost provides free peer-reviewed portable C++ source libraries.