Fwd: Cannot `dynamic_cast` custom wrapped widget from Gtk::Builder

[Daniel Boles <dboles src gmail com>]

---------- Forwarded message ---------
From: Daniel Boles <dboles src gmail com>
Date: Fri, 1 May 2020, 22:31
Subject: Re: Cannot `dynamic_cast` custom wrapped widget from Gtk::Builder
To: Josh Bialkowski <josh bialkowski gmail com>

On Fri, 1 May 2020, 22:29 Josh Bialkowski via gtkmm-list, <gtkmm-list gnome org> wrote:

Everything compiles, but when I change the above code to:

~~~
Gtk::PanZoomArea panzoom_;
builder->get_widget("overhead-view", panzoom_)
~~~

the member is assigned nullptr and I see the following errors printed to stderr:

~~~
: CRITICAL **: 13:53:12.873: Gtk::Builder::get_widget(): dynamic_cast<> failed.
~~~

Did you miss an asterisk in that declaration? get_widget() wants a pointer as argument.