new() with typedesc

examples/gtk3/count_button.nim

@@ -1,27 +1,28 @@
 # nim c count_button.nim
-import gintro/[gtk, glib, gobject, gio]
+import gintro/[gtk, gobject, gio]
 
 type
   CountButton = ref object of Button
     counter: int
 
-when compileOption("gc", "arc"):
+when defined(gcDestructors):
   proc `=destroy`(x: var typeof(CountButton()[])) =
     gtk.`=destroy`(typeof(Button()[])(x))
 
 proc buttonClicked (button: CountButton; decrement: int) =
   dec(button.counter, decrement)
-  button.label = "Counter: " & $button.counter 
+  button.label = "Counter: " & $button.counter
   echo "Counter is now: ", button.counter
 
 proc appActivate (app: Application) =
-  var button: CountButton
+  #var button: CountButton
   let window = newApplicationWindow(app)
   window.title = "Count Button"
-  initButton(button, "Counting down from 100 by 5")
+  #initButton(button, "Counting down from 100 by 5") # deprecated
+  let button = newButton(CountButton, "Counting down from 100 by 5")
   button.counter = 100
   window.add(button)
-  button.connect("clicked",  buttonClicked, 5)
+  button.connect("clicked", buttonClicked, 5)
   window.showAll
 
 proc main =