RE: [Boost-Users] bind: I just keep trying...

26 Sep 2002

      Thanks.  I changed the map to:
      typedef map > MyMessageMap;

No errors but enough warnings to choke a horse.  Have I just been nailed by
VC6SP4?  If so, I think I'll just give up and map the session-ids to Y*s.
%>(

Thanks in advance for any suggestions.

<warnings>
--------------------Configuration: MyProject - Win32
Debug--------------------
Compiling...
Z.cpp
c:\boost\function.hpp(451) : warning C4097: typedef-name 'base_type' used
as synonym for class-name
'function::function1'
        c:\boost\function.hpp(497) : see reference to class template
instantiation 'boost::function' being
compiled
c:\boost\function.hpp(452) : warning C4097: typedef-name 'base_type' used
as synonym for class-name
'function::function1'
        c:\boost\function.hpp(497) : see reference to class template
instantiation 'boost::function' being
compiled
c:\boost\function.hpp(453) : warning C4097: typedef-name 'base_type' used
as synonym for class-name
'function::function1'
        c:\boost\function.hpp(497) : see reference to class template
instantiation 'boost::function' being
compiled
c:\boost\function.hpp(451) : warning C4097: typedef-name 'base_type' used
as synonym for class-name 'function::fun
ction2'
        c:\program files\microsoft visual studio\vc98\include\utility(26) :
see reference to class template instantiation 'boost::function' being compiled
        c:\program files\microsoft visual studio\vc98\include\xtree(28) :
see reference to class template instantiation 'std::pair >' being compiled
        c:\program files\microsoft visual studio\vc98\include\map(46) : see
reference to class template instantiation 'std::_Tree >,struct std::map,struct std::less<class session_id>,class
std::allocator
...
...
::_K
fn,struct std::less<class session_id>,class std::allocator
' being compiled
        c:\src\inc\Z.h(240) : see reference to class template instantiation
'std::map,struct std::less<class
session_id>,class std::allocator > >' being compiled
c:\boost\function.hpp(452) : warning C4097: typedef-name 'base_type' used
as synonym for class-name 'function::fun
ction2'
        c:\program files\microsoft visual studio\vc98\include\utility(26) :
see reference to class template instantiation 'boost::function' being compiled
        c:\program files\microsoft visual studio\vc98\include\xtree(28) :
see reference to class template instantiation 'std::pair >' being compiled
        c:\program files\microsoft visual studio\vc98\include\map(46) : see
reference to class template instantiation 'std::_Tree >,struct std::map,struct std::less<class session_id>,class
std::allocator
::_K
fn,struct std::less<class session_id>,class std::allocator
' being compiled
        c:\src\inc\Z.h(240) : see reference to class template instantiation
'std::map,struct std::less<class
session_id>,class std::allocator > >' being compiled
c:\boost\function.hpp(453) : warning C4097: typedef-name 'base_type' used
as synonym for class-name 'function::fun
ction2'
        c:\program files\microsoft visual studio\vc98\include\utility(26) :
see reference to class template instantiation 'boost::function' being compiled
        c:\program files\microsoft visual studio\vc98\include\xtree(28) :
see reference to class template instantiation 'std::pair >' being compiled
        c:\program files\microsoft visual studio\vc98\include\map(46) : see
reference to class template instantiation 'std::_Tree >,struct std::map,struct std::less<class session_id>,class
std::allocator
::_K
fn,struct std::less<class session_id>,class std::allocator
' being compiled
        c:\src\inc\Z.h(240) : see reference to class template instantiation
'std::map,struct std::less<class
session_id>,class std::allocator > >' being compiled
Z.obj - 0 error(s), 6 warning(s)
</warnings>

                      Tom Matelich                                                                                                    

                      .com>                    cc:                                                                                    
                                               Subject: RE: [Boost-Users] bind:  I just keep trying...                                
                      09/26/2002 08:40                                                                                                
                      AM                                                                                                              
                      Please respond                                                                                                  
                      to Boost-Users                                                                                                  

I think the best solution for you would be to put boost::function<short>'s
in your map.  Look at the example in the bind documentation at
http://www.boost.org/libs/bind/bind.html#with_boost_function

Tom
...
-----Original Message-----
From: dick.bridges@tais.com [mailto:dick.bridges@tais.com]
Sent: Thursday, September 26, 2002 7:57 AM
To: Boost-Users@yahoogroups.com
Subject: RE: [Boost-Users] bind: I just keep trying...
I'm trying to store member function pointers.  For purposes of this
discussion, the key is an int.
<context>
X is the virtual base class for polymorphic message classes.
      all messages have a session-d attribute
Ys are instances of classes derived from a virtual message hanler base
class.
      foo() is the message handler function.
Z is the 'message pump' that dispatches messages to Ys based upon the
session-id.
Y instances insert make_pair(session-id, message_handler)
pairs into the
map.
      (I think _1 is 'this' during the insert.)
Z calls the Y instance message-handler  using the session-id
key to the
map.
</context>
Mark Storer

.com>                    cc:
Subject: RE:
[Boost-Users] bind:  I just keep trying...
09/25/2002 04:47
PM
Please respond
to Boost-Users
I'm a little confused as to what you're aiming for here... a
map of ints to
function pointers (that can point to Y::foo)?
This should do the trick, provided I'm recalling my function pointer
declarations correctly
std::map
Further boost::bind creates an INSTANCE of a functor.  Giving
the compiler
an instance when it wants a type is not a good way to keep it happy.
Now if what you're actually after is calling Y::foo on a
colleciton of Y's,
then you don't need a collection of function pointers for
each instance in
the first place, which is where bind comes in.  According to my flimsy
understanding of bind (I haven't used it yet), this should do
the trick:
X someX;
std::vector<Y> &wise = BuildYs();  // wise == plural of Y
std::for_each(
  wise.begin(),
  wise.end(),
  boost::bind<short>(&Y::foo, &someX)
);
If you want the X parameter to vary from one call of foo to
the next, I
suggest rolling your own loop... or incorporating the X* into
Y, at which
point you can get rid of the X* parameter, and use
boost::bind(&Y::foo), or
std::mem_fun(&Y::foo).
--Mark Storer
  Software Engineer
  Cardiff Software
#include <disclaimer>
typedef std::disclaimer<Cardiff> Discard;
-----Original Message-----
From: dick.bridges@tais.com [mailto:dick.bridges@tais.com]
Sent: Wednesday, September 25, 2002 4:08 PM
To: boost-users@yahoogroups.com
Subject: [Boost-Users] bind: I just keep trying...
Everytime I think I have a clue, I'm reminded how little I REALLY
understand.
<error compiler='VC6SP4'>
'map' : invalid template argument for '_Ty', type expected
</error>
<snippet>
struct X
{
}
struct Y
{
      short foo(X*);
}
struct Z
{
      map myMap;
}
</snippet>
I thought I saw how to do this somewhere on the website but I
sure can't
find it now.  Any help GREATFULLY appreciated.
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RE: [Boost-Users] bind: I just keep trying...

dick.bridges＠tais.com