[Boost-bugs] [Boost C++ Libraries] #5686: Member function and member variable pointers don't work well with shared_ptr

Subject: [Boost-bugs] [Boost C++ Libraries] #5686: Member function and member variable pointers don't work well with shared_ptr
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2011-07-11 23:24:58

#5686: Member function and member variable pointers don't work well with
shared_ptr
------------------------------------------+---------------------------------
 Reporter:  patvarilly@…                  |       Owner:  pdimov   
     Type:  Bugs                          |      Status:  new      
Milestone:  To Be Determined              |   Component:  smart_ptr
  Version:  Boost 1.45.0                  |    Severity:  Problem  
 Keywords:  shared_ptr pointer-to-member  |  
------------------------------------------+---------------------------------
 The current implementation of shared_ptr doesn't overload operator->*, so
 member function and member variable pointers don't play nicely with
 shared_ptrs.  I would imagine that this is trivial to fix given the
 existing operator-> implementation.  Here's an example of what doesn't
 work but should:

 {{{
 #!cpp
 class A
 {
 public: int memberA;
 }

 ...
 int A::*memberVariablePtr = &A::memberA;
 shared_ptr<A> ASharedPtr( ... );

 // The following two pieces of code should be functionally identical

 // 1) Doesn't compile.  Error in g++: "base operand of -> is not a
 pointer"
 //      It took me a while to figure out what g++ was complaining about
 int val = ASharedPtr->*memberVariablePtr;

 // 2) Compiles and works just fine
 int val = ASharedPtr.get()->*memberVariablePtr;
 }}}

 Note: I tried this with version 1.45.0, but looked up the documentation of
 shared_ptr in 1.46.1 to make sure that this hasn't already been addressed.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/5686>
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