Re: [Boost-users] member functions as slots with signals?

note the additions and comments At Tuesday 2003-09-30 14:11, you wrote:

First, thanks for the prompt reply.

I was wondering about mem_fn also IMO updating the docs to reflect that would be quite useful.... I think I personal prefer mem_fn() for our application.

At Tuesday 2003-09-30 13:47, you wrote:

...

On Tuesday 30 September 2003 04:12 pm, Victor A. Wagner, Jr. wrote:

...

I've been over the documentation several times and I keep getting the feeling that I'm just missing something. I'd like to have some member functions (methods) as slots for some signals (a la QT). I suspect that there is some form of bind that I could use, but it's certainly not obvious to me.

Yep, bind can do it:

struct X { int foo(float, char);

void blah() const;

...

};

signal sig; sig.connect(bind(&X::foo, _1, _2, _3));

X xt; signal sigx; sigx.connect(bind(&X::blah, &xt)); /// the above is more in line with what QT does with it's connect (i.e. binds it to an instance and method) /// now only if there were some nifty syntactic sugar we could come up with so we could: sigx.connect(magicsugar(&xt.blah)); /// which would more clearly show the intent, IMO

...

// or sig.connect(mem_fn(&X::foo));

The _1 is the implicit object parameter ("this") that the member function pointer is invoked with.

Doug

btw, I sent you a bug report w/ msvc++7.1 and debug assertion (heap not valid) when destructing a signal

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