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

<mstorer@cardiff To: "'Boost-Users@yahoogroups.com'" <Boost-Users@yahoogroups.com>

.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<int, short()(*X)>

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<int, bind(&Y::foo, _1, _2) > 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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