Re: [Boost-bugs] [Boost C++ Libraries] #1076: compile error: disconnecting struct with operator()() doesn't work in VS2005 SP1

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #1076: compile error: disconnecting struct with operator()() doesn't work in VS2005 SP1
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2010-04-21 16:22:38

#1076: compile error: disconnecting struct with operator()() doesn't work in
VS2005 SP1
---------------------------------+------------------------------------------
  Reporter:  boris@…             |       Owner:  dgregor    
      Type:  Bugs                |      Status:  reopened   
 Milestone:  To Be Determined    |   Component:  signals    
   Version:  Boost 1.34.0        |    Severity:  Showstopper
Resolution:                      |    Keywords:  error      
---------------------------------+------------------------------------------
Changes (by Martin Pyle <MartinNvPyle@…>):

 * cc: MartinNvPyle@… (added)
  * status:  closed => reopened
  * resolution:  invalid =>

Comment:

 In:
  http://lists.boost.org/boost-users/2007/07/29153.php

 Boris showed some error output. That seems to show his original problem
 with signal::disconnect was while using boost::function, not a hand
 crafted struct/functor as is shown here. I think he may have over
 simplified his example.

 I have the same problem Boris had. Using VS2005, and a boost::function
 object I get operator==() cant be found errors when calling
 signal::disconnect.
 Of course, boost::function does have an operator==().

 Here's an example:

 {{{
 #include <boost/signal.hpp>
 #include <boost/function.hpp>

 void foo()
 {
 }

 void TrySignalDisconnect()
 {
         typedef boost::function<void()> MyFunctorType;

         MyFunctorType myFunctorFoo(&foo);

         assert( &foo == myFunctorFoo ); //compiles!
         //assert( myFunctorFoo == myFunctorFoo) ); //will NOT compile

         boost::signal<void()> sig;
         sig.connect(myFunctorFoo);
         //sig.disconnect(myFunctorFoo); //will NOT compile -- same reason

 }

 }}}

 To me it looks like boost::function will compare with a raw function
 pointer, but not another boost::function ?

 I hope this isn't bending the meaning of this bug too far.
 I'm using boost 1.35.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/1076#comment:6>
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