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I doubt that it's possible to have a
signal that returns a reference. Is this new code, or has it ever
been possible to compile it? The compiler claims that the error is
in slot.h line 516. It's this line, isn't it?
return T_return();
with T_return = WebKit::WebView&. If T_return were
WebKit::WebView*, T_return() would be 0. If T_return were
WebKit::WebView, T_return() would be a call to WebView's default
constructor.
I searched through glibmm and gtkmm. There is not a single example
of a _WRAP_SIGNAL wrapping a signal that returns a reference. A
few signals return either a plain pointer or a Glib::RefPtr.
Kjell
2013-03-18 05:54, Gavin Lambert skrev:
Hi
Dannick,
These
sorts of errors typically mean that there is some
disagreement on the number or types of parameters between
the C signal and its C++ wrapper (in this case
“inspect_web_view” on WebKitWebInspector), or in your
parameter conversion definitions. Check the definition of
this signal in the actual WebKit-GTK C code, in the .defs
files (I assume that you have regenerated these as needed),
and in your .hg and .ccg files.
Regards,
Gavin
Lambert
From: gtkmm-list
[mailto:gtkmm-list-bounces gnome org] On Behalf Of
Dannick Pomerleau
Sent: Monday, 18 March 2013 17:12
To: Kjell Ahlstedt
Cc: Gtkmm
Subject: Re: Error compiling webkitmm
On 03/11/2013 03:41 AM, Kjell Ahlstedt
wrote:
2013-03-11 05:57, Dannick Pomerleau
skrev:
The error is comming from this
function.
inline T_return operator()(arg1_type_ _A_a1) const
{
if (!empty() && !blocked())
return
(reinterpret_cast<call_type>(slot_base::rep_->call_))(slot_base::rep_,
_A_a1);
return T_return();
}
/home/dannick/Documents/programming/webkitmm/mainline/webkit/webkitmm/webinspector.cc:249:1:
required from here
/usr/include/sigc++-2.0/sigc++/functors/slot.h:516:23:
error: value-initialization of reference type
'WebKit::WebView&'
Compilation error messages from
libsigc++'s many C++ template functions and template
classes can be very difficult to interpret.
The compiler says the error is in slot.h, but don't take
that for granted. It can be somewhere else. To start with,
it's interesting to know what's in webinspector.cc, around
line 249.
Kjell
Sorry I did not get back sooner here is
the function from webinspector.cc at around line 249. It
starts at 235.
static WebKitWebView*
WebInspector_signal_inspect_web_view_callback(WebKitWebInspector*
self, WebKitWebView* p0,void* data)
{
using namespace WebKit;
typedef sigc::slot< WebView&,WebView& >
SlotType;
// Do not try to call a signal on a disassociated wrapper.
if(Glib::ObjectBase::_get_current_wrapper((GObject*)
self))
{
#ifdef GLIBMM_EXCEPTIONS_ENABLED
try
{
#endif //GLIBMM_EXCEPTIONS_ENABLED
if(sigc::slot_base *const slot =
Glib::SignalProxyNormal::data_to_slot(data))
return
((*static_cast<SlotType*>(slot))(*Glib::wrap(p0)
)).gobj();
#ifdef GLIBMM_EXCEPTIONS_ENABLED
}
catch(...)
{
Glib::exception_handlers_invoke();
}
#endif //GLIBMM_EXCEPTIONS_ENABLED
}
typedef WebKitWebView* RType;
return RType();
}
Here is a link to the github repository I created with the
changes I have made until now.
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