Re: [sigc] How does std::function<> work with libsigc++

[Murray Cumming <murrayc murrayc com>]

On Fri, 2013-07-26 at 08:06 -0400, Paul Davis wrote:
> On Fri, Jul 26, 2013 at 7:03 AM, Murray Cumming <murrayc murrayc com>
> wrote:
>         C+11 has std::function<> which is a bit like sigc::slot,
>         though C++11
>         doesn't have anything like sigc::signal<>. I played with that
>         here:
>         http://www.murrayc.com/permalink/2013/07/08/c-in-glom-shared_ptr-and-slotsfunctions/
>         
>         I've noticed that std::function<> works with libsigc++, as in
>         the code
>         below, but I wonder why it works. Can anyone explain?
>         
>
>
> I have used boost::function with sigc++, and my guess when it worked
> is that sigc++::slot (like boost slots and other similar libraries,
> including our own that we use for ardour) only requires an
> operator()() (i.e. functor invocation), which std::function also
> provides. last time i looked, sigc::slot is heavily templated, so any
> class that provides the required (minimal) API will work.
>
>
> what made you expect that it would *not* work?

Because the signals' connect() function seems to take specifically
sigc::slot:
https://developer.gnome.org/libsigc
++/unstable/classsigc_1_1signal7.html#adc55ac9b0f935fd87a67904022e03cb2

But I haven't looked at it enough detail.

-- 
Murray Cumming
murrayc murrayc com
www.murrayc.com
www.openismus.com