Re: [boost] Slignal library: Slot connection to signal

From: Brunen, Johannes (jbrunen_at_[hidden])
Date: 2002-09-02 03:46:16

Hi Doug,

>> This works pretty fine. However, when I tried to use a slot functor
defined 
>> in class A it doesn't compile anymore: 
>> 
>> class A 
>> { 
>> void somefun(X& x); 
>> public: 
>> struct SlotFunctor 
>> { 
>> SlotFunctor(A& a) : _a(a) {} 
                        ^ const 

> SlotFunctor isn't CopyConstructible, so it can't be used with
Boost.Function 
> (and, therefore, Boost.Signals). Let me know if that fixes the problem... 

Finally, I found time to make the SlotFunctor CopyConstructible.

class A 
{ 
        void somefun(X& x); 
public: 
    struct SlotFunctor
    {
        SlotFunctor() : _a(NULL) {}
        SlotFunctor(A* a) : _a(a) {}
        SlotFunctor(const SlotFunctor& r) : _a(r._a) {}
        void operator() () const
        { ... }

        A*    _a;
    };

However, with the same result i.e. error message:

..\..\..\..\Comp\Boost\boost/signals/slot.hpp(97): error C2664:
'boost::reference_wrapper<XUIDlgTest::SlotOnClick const>
boost::signals::detail::slot_base::get_invocable_slot(const
XUIDlgTest::SlotOnClick &,boost::signals::detail::signal_tag)': cann
ot convert parameter 2 from 'boost::signals::detail::value_tag' to
'boost::signals::detail::signal_tag'
        No constructor could take the source type, or constructor overload
resolution was ambiguous
        D:\_2376\XCADdy\cpp\applic\common\ui\src\XUIDlgTest.cxx(210): see
reference to function template instantiation
'boost::slot<boost::function0<void,boost::empty_function_policy,boost::empty
_function_mixin,int>>(const XUIDlgTest::SlotOnClick &)
' being compiled
..\..\..\..\Comp\Boost\boost/signals/slot.hpp(97): error C2143: syntax error
: missing ')' before 'const'
        D:\_2376\XCADdy\cpp\applic\common\ui\src\XUIDlgTest.cxx(210): see
reference to function template instantiation
'boost::slot<boost::function0<void,boost::empty_function_policy,boost::empty
_function_mixin,int>>(const XUIDlgTest::SlotOnClick &)
' being compiled
..\..\..\..\Comp\Boost\boost/signals/slot.hpp(97): error C2780: 'const F
&boost::signals::detail::slot_base::get_invocable_slot(const F
&,boost::signals::detail::value_tag)': expects 2 arguments - 1 provided
        ..\..\..\..\Comp\Boost\boost/signals/slot.hpp(56): see declaration
of 'get_invocable_slot'
        D:\_2376\XCADdy\cpp\applic\common\ui\src\XUIDlgTest.cxx(210): see
reference to function template instantiation
'boost::slot<boost::function0<void,boost::empty_function_policy,boost::empty
_function_mixin,int>>(const XUIDlgTest::SlotOnClick &)
' being compiled
..\..\..\..\Comp\Boost\boost/signals/slot.hpp(97): error C2780: 'const F
&boost::signals::detail::slot_base::get_invocable_slot(const F
&,boost::signals::detail::reference_tag)': expects 2 arguments - 1 provided
        ..\..\..\..\Comp\Boost\boost/signals/slot.hpp(52): see declaration
of 'get_invocable_slot'
        D:\_2376\XCADdy\cpp\applic\common\ui\src\XUIDlgTest.cxx(210): see
reference to function template instantiation
'boost::slot<boost::function0<void,boost::empty_function_policy,boost::empty
_function_mixin,int>>(const XUIDlgTest::SlotOnClick &)
' being compiled
..\..\..\..\Comp\Boost\boost/signals/slot.hpp(97): error C2780:
'boost::reference_wrapper<F>
boost::signals::detail::slot_base::get_invocable_slot(const F
&,boost::signals::detail::signal_tag)': expects 2 arguments - 1 provided
        ..\..\..\..\Comp\Boost\boost/signals/slot.hpp(48): see declaration
of 'get_invocable_slot'
        D:\_2376\XCADdy\cpp\applic\common\ui\src\XUIDlgTest.cxx(210): see
reference to function template instantiation
'boost::slot<boost::function0<void,boost::empty_function_policy,boost::empty
_function_mixin,int>>(const XUIDlgTest::SlotOnClick &)
' being compiled
..\..\..\..\Comp\STLport\stlport\stl/_alloc.h(358): fatal error C1004:
unexpected end of file found
        D:\_2376\XCADdy\cpp\applic\common\ui\src\XUIDlgTest.cxx(210): see
reference to function template instantiation
'boost::slot<boost::function0<void,boost::empty_function_policy,boost::empty
_function_mixin,int>>(const XUIDlgTest::SlotOnClick &)