Re: [Boost-bugs] [Boost C++ Libraries] #4089: Memory leak in Boost.Signals2 when the signal is not invoked

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #4089: Memory leak in Boost.Signals2 when the signal is not invoked
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-06-27 14:48:45

#4089: Memory leak in Boost.Signals2 when the signal is not invoked
-------------------------------+----------------------
  Reporter:  dan.berindei@…    |      Owner:  fmhess
      Type:  Bugs              |     Status:  reopened
 Milestone:  To Be Determined  |  Component:  signals2
   Version:  Boost 1.55.0      |   Severity:  Problem
Resolution:                    |   Keywords:
-------------------------------+----------------------
Changes (by julien.puydt@…):

 * status:  closed => reopened
 * version:  Boost 1.42.0 => Boost 1.55.0
 * resolution:  fixed =>
 * milestone:  Boost 1.43.0 => To Be Determined

Comment:

 The following code gives wrong results with 1.55.0 ; it shows kept
 references trough a disconnection, which get released only if the signal
 is triggered :
 {{{
 #include <boost/smart_ptr.hpp>
 #include <boost/signals2.hpp>
 #include <iostream>

 void
 print (boost::shared_ptr<int> & ptr)
 {
   std::cout << "Pointer has use count: " << ptr.use_count () << std::endl;
 }

 int
 main (int argc,
       char* argv[])
 {
   boost::signals2::signal<void(void)> sig;
   boost::shared_ptr<int> ptr(new int);

   // one ref here: should be 1
   print (ptr);

   boost::signals2::connection conn = sig.connect (boost::bind (&print,
 ptr));

   // one ref here, one in the bind: should be 2
   print (ptr);

   // is supposed to release the bind reference
   conn.disconnect ();

   // one ref here: should be 1
   print (ptr);

   // this isn't supposed to release a reference!
   sig ();

   // one ref here: should be 1
   print (ptr);

   return 0;
 }
 }}}

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/4089#comment:3>
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