RE: [Boost-users] [Signals] Named slot group usage?

From: Brian Braatz (brianb_at_[hidden])
Date: 2005-02-11 11:21:38

I do not use named slots.

I do however wish that I could Add META-DATA to the slot. 

Specifically, for debugging I would like signals to store a user
supplied structure with the slot.

Why I am requesting this:
        I have one library that rides on top of signals\slots
extensively. Because I am using it quite extensively, it is difficult to
debug. I want to be able to "go back later" and have code that can tell
me where that slot "came from".

Right now, I keep this separate in a vector<mystruct>. This is ugly,
because the slot can disappear without the vector knowing about it.

The other thing I would also like to use this functionality for would be
this:

Fire a signal, where only slots that get notified are the ones that
match an expression which checks the metadata I have provided.

Even if I have to do this manually- this would be a nice feature for my
usage of slots\signals.

(yes I am pushing this library beyond what it was designed for and
understand that :) )

> -----Original Message-----
> From: boost-users-bounces_at_[hidden] [mailto:boost-users-
> bounces_at_[hidden]] On Behalf Of Douglas Gregor
> Sent: Friday, February 11, 2005 5:59 AM
> To: Boost mailing list
> Cc: boost-users_at_[hidden]
> Subject: [Boost-users] [Signals] Named slot group usage?
> 
> I'm trying to determine how widely used named slot groups are in the
> Signals library. I would appreciate it if I could get some feedback on
> if they're used, how they're used, etc. In particular:
> 
> 	(1) Do you use named slot groups?
> 	(2) Did the FIFO ordering guarantees in 1.32.0 and the ability
to
> add
> to the front or back of the slot list alleviate the need for named
slot
> groups?
> 	(3) If performance of connection/disconnection of named slot
groups
> were to get worse (e.g., linear in the number of slots), would it
> seriously impact the performance of your application?
> 
> Responses should probably come to me, personally, unless they would be
> of interest to the group.
> 
> Background: Signals performance is sub-par, and much of the problem
can
> be traced back to support for named slot groups. I'm trying to
> determine the best way to proceed.
> 
> 	Thanks,
> 	Doug
> 
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