Creating a window with gtkmm 3 and a glade description.

gtkmm-example.cpp

// g++ -std=c++14 -o gtkmm-example gtkmm-example.cpp `pkg-config --cflags --libs gtkmm-3.0`

#include <memory>
#include <gtkmm.h>

class MainWindow : public Gtk::ApplicationWindow {
public:
    MainWindow(BaseObjectType* obj, Glib::RefPtr<Gtk::Builder> const& builder)
        : Gtk::ApplicationWindow(obj)
        , builder{builder}
    {
    }

    virtual ~MainWindow() = default;

private:
    Glib::RefPtr<Gtk::Builder> builder;
};

int main(int argc, char* argv[]) {
    auto app = Gtk::Application::create(argc, argv, "de.engelmarkus.example");
    auto builder = Gtk::Builder::create();

    builder->add_from_string(
        "<interface>"
        "  <object class='GtkApplicationWindow' id='MainWindow'>"
        "    <property name='title'>The MainWindow</property>"
        "  </object>"
        "</interface>"
    );

    MainWindow* wnd = nullptr;

    builder->get_widget_derived("MainWindow", wnd);

    auto r = app->run(*wnd);

    delete wnd;

    return r;
}