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    <p>Oh, there are tons of example. Just have a look at anything within glib or gtk. You can see the work of function pointers in work there all the way. </p> <p>Here e.g the initialization of the gtk_button stuff.</p> <pre><code> static void gtk_button_class_init (GtkButtonClass *klass) { GObjectClass *gobject_class; GtkObjectClass *object_class; GtkWidgetClass *widget_class; GtkContainerClass *container_class; gobject_class = G_OBJECT_CLASS (klass); object_class = (GtkObjectClass*) klass; widget_class = (GtkWidgetClass*) klass; container_class = (GtkContainerClass*) klass; gobject_class->constructor = gtk_button_constructor; gobject_class->set_property = gtk_button_set_property; gobject_class->get_property = gtk_button_get_property; </code></pre> <p>And in gtkobject.h you find the following declarations:</p> <pre><code> struct _GtkObjectClass { GInitiallyUnownedClass parent_class; /* Non overridable class methods to set and get per class arguments */ void (*set_arg) (GtkObject *object, GtkArg *arg, guint arg_id); void (*get_arg) (GtkObject *object, GtkArg *arg, guint arg_id); /* Default signal handler for the ::destroy signal, which is * invoked to request that references to the widget be dropped. * If an object class overrides destroy() in order to perform class * specific destruction then it must still invoke its superclass' * implementation of the method after it is finished with its * own cleanup. (See gtk_widget_real_destroy() for an example of * how to do this). */ void (*destroy) (GtkObject *object); }; </code></pre> <p>The (*set_arg) stuff is a pointer to function and this can e.g be assigned another implementation in some derived class.</p> <p>Often you see something like this</p> <pre><code>struct function_table { char *name; void (*some_fun)(int arg1, double arg2); }; void function1(int arg1, double arg2).... struct function_table my_table [] = { {"function1", function1}, ... </code></pre> <p>So you can reach into the table by name and call the "associated" function. </p> <p>Or maybe you use a hash table in which you put the function and call it "by name".</p> <p>Regards <br> Friedrich</p>
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    1. POHow can I use an array of function pointers?
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    1. USJonathan Leffler
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    1. COWould it be pssible to use such a function_table for hashing functions within the hash table implementation itself? (Read: circular dependecy involved).
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      1. USFlavius
 

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