[Help-smalltalk] handling Foo ** C callouts

[Robert Collins]

Some of the GTK API's have signatures like:

gboolean    gtk_tree_selection_get_selected (GtkTreeSelection
*selection,
                                             GtkTreeModel **model,
                                             GtkTreeIter *iter);


This is how I have implemented using it:

    modelptr:=GTK.GtkTreeModelPointer new.
    iter:=GTK.GtkTreeIter new.
    (selection getSelected: modelptr iter: iter) ifTrue:
      [
        |model|
        model:=modelptr model value.
        ... use model.

GtkTreeModelPointer is:
CStruct subclass: #GtkTreeModelPointer
  "FIXME: this should be automatically created, or
  passing #cObjectPtr should be smarter or something"
  declaration: #(
  (#model (#ptr #GtkTreeModel))
  )
  classVariableNames: ''
  poolDictionaries: ''
  category: 'GTK'
  !

It would be nice if the structs.awk file could synthesis types like this
when Foo ** signatures are found.

Rob


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