[C++-sig] Boost::Signals - Python functions as slots

[Benny Kramek]

I'm using Boost::Signals in C++. I want to be able to attach python
functions as slots to the C++ signals. Here is a very simple test that
doesn't work. Everything compiles OK, but I get a Python error.

### C++ class

class Button 
{
    public:
        void doOnClick(const boost::signal<void ()>::slot_type& slot);

    private:
        boost::signal<void ()> onClick;
};

void Button::doOnClick(const boost::signal<void ()>::slot_type& slot)
{
    onClick.connect(slot);
}

### Boost::Python Module

class_<Button>("Button")
    .def("doOnClick", &Button::doOnClick)
    ;

### Python test

def f():
    print 'f'

button = Button()
button.doOnClick(f)

### Python error

    button.doOnClick(f)
Boost.Python.ArgumentError: Python argument types in
    Button.doOnClick(Button, function)
did not match C++ signature:
    doOnClick(Button {lvalue}, N5boost4slotINS_8functionIFvvESaIvEEEEE)

The demangled name
N5boost4slotINS_8functionIFvvESaIvEEEEE
is
boost::slot<boost::function<void ()(), std::allocator<void> > >

I'm using gcc 3.2.3 and boost 1.31.0

Thanks for any help,
Benny

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