Am Thu, 04 Oct 2012 18:31:17 +0200
schrieb Horváth Imre <[email protected]>:
> Hi!
>
> IS there a solution to use Glib::RefPtr with sigc::mem_fun?
> Example:
>
> Glib::RefPtr<MyClass> c;
> ...
> button.signal_clicked().connect(sigc::mem_fun(c,
> &MyClass::on_button));
yes, there is, by using sigc lambdas. a little complicated but it works.
short example program (replace std::shared_ptr by Glib::RefPtr):
<code>
#include <memory>
#include <sigc++/sigc++.h>
namespace sigc
{
// the partially specialized struct dereference_trait is essential,
// otherwise sigc can't deduce the return type from expression *sigc::_1
template <class T>
struct dereference_trait<std::shared_ptr<T> >
{ typedef T type; };
template <class T>
struct dereference_trait<std::shared_ptr<T>& >
{ typedef T type; };
}
struct MyClass
{
void on_button()
{
}
};
int main()
{
std::shared_ptr<MyClass> c(new MyClass);
sigc::slot<void> f =
sigc::bind(sigc::group(sigc::mem_fun(&MyClass::on_button),
*sigc::_1),
c);
f();
return 0;
}
</code>
if you have variadic templates available you could pack the
sigc::bind(sigc::group()) part into a factory function, in order to
make the code more readable.
greetings,
klaus
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