Re: [Boost-users] Beginner question: Why boost::signal creates another instance of the slot object ?

Subject: Re: [Boost-users] Beginner question: Why boost::signal creates another instance of the slot object ?
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2010-08-19 18:20:03

AMDG

Mauricio Gomes wrote:
> I am running the program below (Vista with boost 1.43, mingw/gcc 4.5.1).
>
> I would expect slot.x to be 5 but it is zero.
>
> Why boost::signal creates another instance of the slot object ?
> What am I missing here ?

boost::signal stores a copy of the function object.  If you
don't want to make a copy use boost::ref.

sig.connect(boost::ref(f));

If you do this, you need to be careful that the
function object doesn't go out of scope too soon.

In Christ,
Steven Watanabe